Judge Robinson files an opinion in Parts I, II, IV and V of which Judge Wilkey and Judge Jameson concur. Judge Wilkey files an opinion in which Judge Jameson concurs, Judge Robinson dissenting for the reasons stated in Part III of his opinion. Thus Parts I, II, IV and V of Judge Robinson’s opinion and Judge Wilkey’s opinion together constitute the opinion of the court. The judgment of conviction appealed from is
Affirmed.
This appeal is taken by James Bernett from his conviction of manslaughter1 following a two-day trial. It raises two claims of error stemming from the District Court’s denial of a motion to suppress, on grounds of involuntariness, an inculpatory oral admission which Bernett made to the police immediately prior to his arrest. The first is that the court’s consideration of the voluntariness issue did not adequately safeguard Bernett’s due process rights. The second is that even if the admission were voluntary, the failure of the court to charge the jury concerning the weight that might be given to it amounted to reversible error.
As to Bernett’s first contention, my colleagues conclude that the admission was made in a noncustodial setting and was, for that reason, voluntary. That position is set forth in Judge Wilkey’s opinion and is, of course, this court’s decision on that phase of the appeal. My own examination of the record compels me to conclude that in evaluating the challenged statement, the District Court *945fell short of the requirement of Sims v. Georgia2 that determinations favorable to voluntariness appear “with unmistakable clarity;” 3 and since I am uncertain as to how the District Court resolved facts bearing critically on the issue, I would remand the case for explicit findings on the voluntariness of the questioned admission, and for a new trial in the event that it is found to have been involuntarily made.4 As to Bernett’s second contention, we conclude unanimously that the omission of the instruction was error but that, viewed in context, the error was nonprejudicial.5
My opinion is in five sections. - Part I presents a summary of the evidence introduced at trial, including the circumstances surrounding the admission under attack. Part II reviews the pretrial suppression hearing on the voluntariness issue. Part III addresses the voluntariness issue, and is a dissenting view to the court’s position. In Part III I outline the relevant case law, explain how I think it should have borne on the volun-tariness determination, and discuss the Government’s charge that the error complained of in that regard was harmless. Part IV treats the court’s failure to charge the jury on the weight it could accord the admission, and expresses our unanimous decision. Part V summarizes the court’s holdings.
I. FACTUAL BACKGROUND
Despite gaps and contradictions in the testimony adduced by the parties at trial, the basic facts as to what occurred on the day of the crime can be reconstructed and summarized. The victim of the homicide of which Bernett was found guilty was one Theodore Nixon, who with Bernett, the latter’s common-law wife, Harriet Smith, and Ben O. Smith (no relation to Harriet Smith) shared a basement apartment at 1441 Euclid Street, Northwest, in the District of Columbia. On the morning of the homicide, the four awoke and began drinking, continuing until they had consumed their available supply of alcohol. Around noon they retired to sleep off the effects of the drinking. Nixon and Ben Smith slept on couches in the living room; Bernett and Ms. Smith went to the bedroom they shared in the back of the apartment. Some time later Bernett left the apartment and when he returned he assumed his role in the fatal episode.
At trial, Bernett gave the jury his version of what occurred.6 When he got back to the apartment, he discovered Nixon sitting on his couch beside Ms. Smith, his hand underneath her dress. Bernett became angry and argued with her; she came after him with a bed slat, which'he took away from her, and then with a knife. He slapped her and she dropped the knife and ran out of the apartment.
Thereupon, Bernett turned his attention to Nixon, whom he accused first of stealing some of his money the week before, and then of stealing his wife. A quarrel ensued and as Bernett turned and walked over toward the couch where Ben Smith was still asleep, Nixon, who was in a thigh-high cast because of a broken leg, hit him with one of his crutches.7 Bernett grabbed a nearby ashtray stand and struck Nixon with it. He then returned to Ben Smith’s sofa, wakened Smith, borrowed five dollars from him and left the apartment.
Ben Smith testified that Bernett had borrowed the five dollars before the four went to sleep, and that he did not wake up until about 4:00 o’clock in the afternoon when Roscoe Moore, a friend, *946shook him and asked him for some wine. Smith called to Nixon but received no reply; observing blood on the latter’s face, Smith summoned an ambulance and the police. Upon their arrival the police discovered that Nixon was dead, and the coroner’s report subsequently revealed that he died from a skull fracture, apparently the result of being struck with the ashtray stand, which lay broken near the couch where the body was found. Smith stated that Ms. Smith was present when he was awakened by Moore and that she had a bruise on her face.
After leaving the apartment following his fight with the deceased, Bernett went to a club where he spent the next two hours drinking. He was found there around 6:00 o’clock by his nephew’s wife, Eartha L. Clark, and his sister, Josephine Battles. Ms. Clark told Bernett that the police were looking for him in connection with a homicide on Euclid Street, and tried to talk him into turning himself in. After drinking another glass of whiskey, he agreed to accompany the two women to Ms. Clark’s apartment.
Between 7:00 o’clock and midnight Bernett remained at the apartment, drinking the entire time, for, in the words of Ms. Clark, “we had to give him a lot of whiskey to keep him there, because otherwise he was going to leave.” According to Ms. Clark, Bernett gave them essentially the same version of his altercation with the deceased that he later advanced at trial.8 Ms. Clark had called the police shortly after bringing Bernett to her apartment, but there was no response until around midnight when Metropolitan Police Officer Ronald L. Schleig arrived after receiving a radio-cast to investigate.
Officer Schleig was met by Ms. Clark outside her apartment, and she explained to him that a man inside was wanted for homicide. The officer accompanied Ms. Clark and she pointed out Bernett, who was seated on the sofa. When asked his name, Bernett blurted out “Jimmy Ber-nett. I know the police are looking for me. I killed a man at 1441 Euclid Street.” 9 Officer Schleig testified that at the time Bernett was drunk and that his speech was slurred.
Bernett accepted the officer’s invitation to accompany him to the station-house, and during the ride he continued to drink from a bottle of whiskey he had taken along. Once in his patrol car, Officer Schleig radioed headquarters to ascertain whether a homicide had occurred that day in the 1400 block of Euclid Street, and whether the police sought a man named Jimmy Bernett. When he received affirmative replies to both inquiries, he pulled the ear over to the side of the street and gave Bernett the Miranda warnings.10
The warnings were repeated to Ber-nett by Officer Louis B. Richardson at the stationhouse. After signing a “consent” form, Bernett gave an oral statement to Officer Richardson, but when it was transcribed he refused to sign it. Officer Richardson testified that at the time these events took place, Bernett was drunk.
Bernett was subsequently indicted for murder in the second-degree,11 and he requested a jury trial. Prior to trial his counsel moved to suppress both his admission to Officer Schleig at the apartment, and the statement to Officer Richardson at the stationhouse. The District Court denied the motion as to the first, and granted it as to the second. After four hours of deliberation, the *947jury returned a verdict of guilty on the lesser-included offense of manslaughter,12 and Bernett was sentenced to imprisonment for five to fifteen years.13 This appeal followed.
11. THE PRETRIAL SUPPRESSION HEARING
As we earlier indicated, Bernett’s trial attorney14 made a pretrial challenge to the admissibility of the statements made respectively to Officers Schleig and Richardson, asserting that these two admissions 15 were involuntary and were given in violation of Miranda v. Arizona.16 While the transcript of the suppression hearing reflects a conscientious effort by the District Court to marshal and resolve the facts concerning the incriminating utterances, it nevertheless appears that the court’s inquiry was limited to factors relevant to the Miranda problem, and that it gave almost no consideration to the question of voluntariness apart from its Miranda aspects.
First, Officer Schleig testified to the statement Bernett made to him, and said that without doubt Bernett was very intoxicated at the time. Although he spoke in a normal tone, his speech was slurred and, according to the officer, when Bernett volunteered the comment concerning his part in the Euclid Street homicide, Officer Schleig “really didn’t believe what was going on because [Ber-nett] was drunk. I thought he was an ordinary drunk just more or less running off at the mouth.” Officer Schleig also testified that Bernett was still drinking in the scout car on the way to the stationhouse.
Next, Officer Richardson testified to events which transpired at the station-house approximately half an hour after Bernett and Officer Schleig departed Ms. Clark’s apartment. By Officer Richardson’s estimate, Bernett had been drinking a lot and was drunk when he signed the Miranda waiver. The officer stated that Bernett had a half-pint bottle of liquor with him when he arrived, but that only a portion of it had previously been consumed.
In argument following the policemen’s testimony, the Government claimed that the first admission — to Officer Schleig —was made in a noncustodial setting, and that the second — to Officer Richardson — was given after a willing and intelligent waiver of Miranda rights. Ber-nett’s counsel disputed both contentions.. The District Court declined to suppress Bernett’s admission to Officer Schleig but held that the one to Officer Richardson must be excluded.
In elaborating on the basis for its rulings, the court explained that when confronted with Bernett’s intoxicated condition, police at the stationhouse were under a duty to do more than perfunctorily read him PD Form 4717 and obtain his signed waiver to properly discharge their responsibility of assuring that he fully understood his constitutional safeguards and knowingly rejected them. Counsel for *948the Government then pressed the court to rule whether the second statement might still be used, under the doctrine of Harris v. New York,18 to impeach Bernett at trial. Harris permits that use of confessions found to be voluntary even where the waiver of Miranda rights is for some reason found to be defective.19 Ber-nett’s attorney contended the statement at the stationhouse was in no way voluntary, and the court agreed, holding that it could not be utilized for impeachment.
Defense counsel then inquired whether the court’s determination on the admissibility of the first statement — the ruling under attack here — was based on the fact that his client was not in custody when he made it at Ms. Clark’s apartment. The court responded in the affirmative, and concluded the suppression hearing. From this it appears that the court’s only finding on voluntariness aside from Miranda considerations was with respect to Bernett’s divulgences at the stationhouse — the . determination made after the Government raised its point on Harris v. New York.20 As to Bernett’s earlier remarks to Officer Schleig, the court’s inquiry stopped short with its conclusion that the situation was noncustodial and, accordingly, that warnings were not required.
III. VOLUNTARINESS OF THE CHALLENGED ADMISSION
Given the District Court’s ruling that, owing to Bernett’s intoxication, his second statement — made half an hour after the first — was involuntary, and given also the substantially identical testimony by the two police officers regarding Bernett’s drunken condition at the apartment and the stationhouse, I am troubled by the absence of any finding as to the voluntariness of the first statement. But more importantly still, I believe the court’s failure to rule explicitly on the voluntariness of the admission challenged here conflicts with the procedural requirements established by the relevant case law. Consequently, I would remand the case to the District Court for an express determination as to whether Bernett was or was not so intoxicated that the first statement was in fact involuntary. My colleagues disagree, however, and the action of the court is affirmance of the District Court’s ruling. My own views follow.
A. The Relationship Between Miranda and Voluntariness Issues Generally
I can well understand the District Court’s preoccupation with questions of custody, warnings and waiver in conducting the voluntariness hearing, since the Supreme Court’s decision in Miranda v. Arizona21 has virtually dominated this area of the law since 1966. As a practical matter, the great bulk of confessions and incriminating admissions 22 sought to be suppressed are made to law enforcement officers by accused persons while in custody, and in such situations *949Miranda has established the threshold inquiries prerequisite to a determination of admissibility. Once in custody, the accused must be advised of his constitutional privilege against self-incrimination and his right to the assistance of counsel.23 He must be warned that anything he says can be used in the prosecution against him, and, if he elects to speak anyway, his statements are admissible only upon a showing that he understood these rights and knowingly and intelligently waived them.24
Pervasive though its influence has been, Miranda cannot be said to have set all prior case law on the subject of vol-untariness for naught. On the contrary, there remain situations where the prior law is still relevant and applicable,25 as the case before us illustrates. Not every inculpatory pronouncement is . made while the declarant is in police custody or is “otherwise deprived of freedom of action in any significant way.” 26 Nor is every guilty disclosure made in response to questioning by law enforcement personnel.27 Apparent compliance with the Miranda procedures does not automatically assure the volun-tariness of a statement,28 any more than failure to adhere to Miranda automatically renders an admission involuntary.29
The focal point of any investigation into the voluntariness of an utterance is the mind of the declarant, and the critical inquiry is whether or not in the totality of the circumstances the assertion is the product of a rational intellect and a free will.30 The rationale behind outlawry of convictions based in whole or in part on involuntary incriminating declarations rests not merely on their probable unreliability,31 but even more importantly on the basic premise that our legal system does not permit' an advantage to be taken of a person lacking the power to make an intelligent choice.32
Thus it can be readily seen that an inquiry into Miranda issues is not coextensive with an investigation of volun-tariness generally. If the accused’s powers of reason and volition are impaired, the question whether he was in custody when he spoke is irrelevant. And even the most patient and thorough explanation of constitutional rights will not make admissible the confession of one whose mental faculties are so blunted by alcohol, drugs or insanity that he cannot be said to have given it voluntarily with understanding. The Miranda requirements are a means of insuring within the limited ambit of custodial questioning that accused persons will be fully informed of their rights, and will knowingly and intelligently choose to relinquish them before making statements *950of a self-incriminating nature. The issue of voluntariness is raised in a more fundamental way where the court’s .attention is called to facts suggesting that the accused’s admissions, whether oral or written, were not the products of a rational intellect and a free will. When a substantial challenge is presented on this issue, the appropriate response is a searching judicial examination which summons all the relevant facts, evaluates them with care, and articulates findings precisely and fully.33 I believe that Ber-nett’s involuntariness claim was of a character to call for that treatment by the District Court.
B. The Voluntariness Problem
At the pretrial suppression hearing, Officer Schleig described Bernett as unquestionably intoxicated when the officer responded to Ms. Clark’s call. Indeed, when Bernett began speaking, Officer Schleig was prepared to dismiss his remarks as those of “an ordinary drunk just more or less running off at the mouth.” The explanation for Ber-nett’s inebriated condition was provided by Ms. Clark, who revealed at trial that in order to persuade him to remain at her apartment, it was necessary to ply him with whiskey for five hours until the police arrived. Moreover, Bernett said he had been imbibing at a club before he was found by Ms. Clark and, according to Ben Smith, he had also participated in a round of drinking at the Euclid Street apartment that morning. Thus, the record yields substantial evidence that Bernett was very inebriated when he confessed his involvement in the homicide to Officer Schleig.
That alcohol consumption may reach such a level as to impair the voluntariness of an incriminating confession has been settled law in this jurisdiction for some time. While our early cases spoke in terms of drunkenness which “goes to the extent of mania,”34 that quaint phraseology reflected a judgment about the impact of intoxicants on the human psyche which has retained its validity over the years. Alcohol, like drugs and mental disease, has the potential to so numb the consciousness that a statement made by a person thus affected cannot be said to be “the product of any meaningful act of volition.”35 And where extreme intoxication presents an issue as to the voluntariness of the accused’s statements, the cases make clear that due process requires careful judicial scrutiny of the matter.
C. Voluntariness: What Does It Mean?
“The ultimate test” of admissibility of confessions, said Justice Frankfurter, “remains that which has been the only clearly established test in Anglo-American courts for two hundred years: the test of voluntariness.” 36 So, too, it is the test levied by the Due Process Clauses of the Fifth and Fourteenth Amendments.37 The initial step, then. *951must be to ascertain, as precisely as possible, just what is embraced within the term “voluntary” when employed in the constitutional sense.
The meaning of the term is neither simple, single nor exact.38 It is, rather, legal shorthand for a complex of values. Perhaps the most succinct, yet the most comprehensive, articulation of these values is found in Blackburn v. Alabama.39 Dissecting the pertinent passage from the Supreme Court’s decision in that case,40 one can enumerate interests protected by exclusion of involuntary confessions from use in criminal prosecutions. One is the interest in trustworthy evidence.41 Another is preservation of individual “freedom of will” and “rational choice.” 42 Still an*952other is deterrence of unlawful police conduct.43 And last, but hardly least, is the integrity of a criminal justice process which should not stoop to take advantage of a person whose volitional power is seriously impaired — as in Blackburn, by insanity,44 or here, by intoxication. These are essentially due process values, and the Due Process Clauses have provided the basis for all of the involuntariness eases of the past three decades — with the exception of Miranda and its progeny, which are not applicable here.45
In particular fact patterns, two or more of the four interests the Supreme Court identified in Blackburn may be implicated. That does not suggest to me that these values are necessarily so interrelated that they can exert force only in unison. On the contrary, I think, abrogation of any one of them will suffice to render a confession inadmissible even if none of the other three is infringed. No untrustworthy statement is admissible even if freely made by a rational
person, without even so much as a hint of police coercion.46 No statement made under police duress is admissible, regardless of its reliability or rationality47 And, I submit, no statement not made rationally and freely is admissible, although there may have been no illegal elicitation by police, and although it may be entirely trustworthy.
D. Rationality and Free Will
The definitional elusiveness of “rationality” and “free will” as concepts has not impeded the Supreme Court in the recurrent use of those terms and similar expressions in opinions dealing with voluntariness.48 “Rationality” is not synonymous with prudence,49 nor is an exercise of “free will” demonstrated merely by showing some sort of conscious choice.50 Rather, as this court quite recently emphasized, the terms have very different meanings in the voluntariness context. In Pea v. United States,51 we explained that “[a] man’s free will and intellect necessarily embrace a freedom of choice,” 52 and that *953“a testimonial statement, whether made at or before trial presents the unique evidentiary contribution of ‘an individual human personality whose attributes of will, perception, memory and volition interact to determine what testimony he will give.’ ” 53 “The make-up of a free man includes,” we continued, “his mechanisms for self-preservation, to refrain from speech that may endanger him.” 54 And “his statement,” we concluded, “does not reflect his own free will or intellect if his statement is attributable in critical measure to the fact that his self-protective mechanism is negated or overridden by external force or fraud, a condition of insanity, the compulsion of drugs . . . [or] the concussion of a bullet shattering in his head, leaving him with the external appearance of coherence, but devoid of his normal will to protect himself and rendered indifferent to protect himself.” 55
When evidence of mental illness,56 drug use,57 physical or psychological duress,58 or intoxication 59 indicates that an inculpatory statement was not understandably and volitionally made, the due process guaranties of the Fifth and Fourteenth Amendments require that *954the statement and its fruits be excluded from use in the criminal prosecution.60 What, in the case at bar, in my view should have been ascertained was the impact of extreme intoxication on Ber-nett’s rationality and free will. The starting point in that inquiry was our own established doctrine that intoxication to the extent of “mania” renders a confession inadmissible.61 That doctrine is by no means novel, having been the rule in a number of jurisdictions for some time.62 Beyond that, the proposition that extreme intoxication can so overpower the reason and free will of a suspect that his confession is involuntary is strongly supported by a recent decision from the Ninth Circuit.
In Gladden v. Unsworth,63 a state appealed a district court’s grant of a writ of habeas corpus on grounds that Uns-worth’s second-degree murder conviction was in part predicated on involuntary admissions by him to the police. Among the statements challenged were several spontaneous oral remarks made shortly after the police arrived at Uns-worth’s cabin and found him “staggering” and “jabbering” in a drunken state. The district court held that these statements, made at a time when he had imbibed so much that he had “no understanding or realization of what was going on or what he was saying,”64 should have been excluded at Unsworth’s state court trial since his intoxicated condition rendered them involuntary.65 The Court of Appeals concurred in the district court’s conclusion that the petitioner’s gross intoxication carried with it such a potential for invasion of his constitutional rights that the guilty verdict could not stand unless vindicated by further inquiry.66 Instead of resolving for itself the issue of voluntariness, the court followed the procedure in Jackson v. Denno 67 and remanded the case to the state courts for such a determination68 One factual aspect of Gladden v. Un-sworth renders it particularly relevant to the case before us. Like the statement challenged here, the incriminating admissions in Gladden were completely spontaneous; 69 there was no evidence of improper interrogation by the police.70 The state argued that this circumstance militated against a finding of involuntariness, but the court disagreed, saying:
[Vjoluntariness is not necessarily established by proving that the confession was spontaneous or by proving the absence of an improper purpose on the part of the questioning officers. If by reason of mental illness, use of drugs, or extreme intoxication, the confession in fact could not be said to be the product of a rational intellect and a free will, to use the test of Townsend v. Sain,71 it is not admissible and its reception in evidence constitutes a deprivation of due process.72
*955For me, Gladden is the touchstone. Taking “rationality” and “free will” in the sense in which the Supreme Court has employed these terms, no basis appears for treating extreme intoxication differently from insanity, drugs, torture or psychological duress for purposes of applying the voluntariness doctrine.73 The common characteristic of all is their propensity for overriding the normal decision-making mechanism of the human intellect to the extent that the suspect is effectively deprived of his rational and volitional capacity. Both in law and in logic, the conclusion seems inescapable that due process is offended by allowing in evidence a confession given while in a condition of such gross intoxication that reason and will are thus impaired. The only possible basis for declining to apply that principle in Ber-nett’s case would be that possible trustworthiness of a confession negates its involuntariness, or that police custody is prerequisite to any application of the voluntariness doctrine. To these problems I now turn.
E. Trustworthiness
As previously observed, the Supreme Court, in Blackburn v. Alabama,74 pointed out that one reason why involuntary confessions are excluded from use in criminal presentations is their possible unreliability.75 This does not mean that confessions otherwise involuntary become admissible simply because they are believed to be reliable. Even assuming the practicality of an estimate on that score when the ruling on admissibility is made,76 the Court has now made it plain that trustworthiness, actual or assumed, is not a panacea for involuntariness.77
That proposition has not always been clear, however. It was limited in some of the earlier confession cases,78 and as late as two decades ago it appeared to have been rejected.79 But in Rogers v. Richmond80 in 1961, the Court held squarely that a state court denied due process by taking into account the probable truth of challenged confessions. Whether, said the Court, the confessions were “not freely self-determined” was “a question to be answered with com*956píete disregard of whether or not [the accused] spoke the truth.” 81 And just a few years later the landmark decision in Jackson v. Denno82 reaffirmed the Rogers principle.83
Thus, reliability of incriminating statements is explicitly outlawed as an element in the determination of constitutional voluntariness, and that doctrine is consistent with and is reflected in the constitutional prohibition against applying the harmless error rule in involuntary confession cases.84 Of course, if trustworthiness were an acceptable factor in the resolution of voluntariness issues, it would be senseless to order new trials in confession cases where the accused’s guilt is borne out by evidence other than the involuntary confession, since that evidence would demonstrate the confession’s reliability. But just as voluntariness may not be settled on the basis of reliability, other incriminating evidence cannot serve to render the admission of an involuntary confession harmless.85 Because the facts of Ber-nett’s case bring the statement in issue within the compass of the voluntariness rule, it -cannot be dealt with simply in terms of whether it is trustworthy, but must be measured by the due process standards which govern confession cases.
F. Custody and Voluntariness
Even a cursory look at the cases treating involuntary confessions reveals that they almost invariably involve statements made while the accused is in custody or is about to be taken into custody. There is a simple explanation for this. As a practical matter, guilty admissions made to persons other than law enforcement officials often do not come to the attention of prosecutors. When they do, the closest examination of the surrounding circumstances frequently fails to disclose any sign of involuntariness. Consequently, the bulk of the incriminating statements aired in courtrooms are made at least in the presence of police officers, whether or not the accused in formally in custody.86 But these factual coincidences, without more, hardly warrant the deduction that custody is an indispensable prerequisite to a finding of involuntariness, and I think a close look at the cases reveals that such a conclusion is not valid.
It has long been the rule that the mere fact that an accused is in custody and subjected to police questioning is not sufficient to raise a voluntariness issue.87 In every involuntariness case achieving success in the Supreme Court, something beside custody and ordinary questioning came into play as the decisive factor. For example, in Brown v. Mississippi,88 the pivotal fact was physical abuse inflicted on the accused by police;89 in Chambers v. Florida,90 it was psychological coercion;91 in Townsend v. Sain,92 it was an injection *957of truth serum;93 and in Blackburn v. Alabama,94 it was the suspect’s insanity.95 Lengthy police interrogation of a normal, healthy person in full possession of his faculties may well produce a confession properly characterized as voluntary, while the same treatment accorded a suspect who is mentally unbalanced would call for a contrary finding with respect to any admission he might make.96 In perspective, it appears that while custody can be and often is a factor which plays some part in overriding the will of a suspect, standing alone it is much less frequently the really important factor in involuntariness decisions.
Moreover, cases which did not involve custody in the strict sense have indicated that voluntariness questions may well arise where there is nothing more than the presence of and perhaps some questioning by police officers. Thus in Jackson v. Denno,97 the Supreme Court, while not resolving admissibility of one of two challenged confessions, did hold that the voluntariness issue was raised where the suspect, who took a taxi to the hospital after suffering a gunshot wound, was questioned there by police and a prosecutor while undergoing emergency treatment.98 And similarly in Pea v. United States,99 the suspect was receiving hospital emergency room treatment for a bullet wound in the head when asked several questions by a policeman, incriminating responses were held involuntary because of his physical condition; custody played no role whatever in that determination.100 And in Gladden v. Unsworth,101 contested oral admissions made upon the arrival of police and neighbors at the suspect’s cabin, and prior to his being placed in custody, were held to be involuntary because of his intoxicated condition.102
In my view, the circumstances of Ber-nett’s case are not sufficiently dissimilar to those in Jackson, Pea and Gladden to exempt him from the due process protection of the voluntariness doctrine. Neither Jackson, Pea nor Unsworth was in custody in the sense of being under the control of law enforcement officials in the potentially intimidating setting of a police arrest or a police stationhouse. And yet, in the case of Pea, the incriminating statements were held to be involuntary; and in the cases of Jackson and Unsworth, a serious question as to vol-untariness was found to exist. These cases strongly suggest that a court is not precluded from finding that such a problem exists with respect to Bernett’s admission simply because he was not yet in custody at the time he spoke to Officer Schleig. I would hold that Bernett’s claim of involuntariness is not diminished by the fact that his admission to Officer Schleig was made spontaneously before custody was assumed, and was not in any way induced by the officer.
G. Judicial Inquiry and Determinations as to Voluntariness
Because of my difficulty with the District Court’s handling of the sensitive issues involved,103 I must now focus on the authorities which set forth the procedures appropriate for resolving them. In Jackson v. Denno104 and Sims v. Georgia105 the Supreme Court established guidelines for courts confronted by the complexities of a voluntariness determination. A primary concern is that the procedures followed “be fully adequate to insure a reliable and clear-*958cut determination of the voluntariness of the confession, including the resolution of disputed facts upon which the voluntariness issue may depend.” 106 Jackson held that the question must in the first instance be dealt with by the judge outside the jury’s presence, so that the jury might be fully insulated from possible prejudice generated by receiving evidence of an involuntary confession.107
Sims treated the problem of a post-Jackson confession which was allowed to go to the jury without any evidence in the record that the trial judge had made a preliminary finding on the voluntariness question.108 Elaborating on Jackson, the Court emphasized that' “[although the judge need not make formal findings of fact or write an opinion, his conclusion that the confession is voluntary must appear from the record with unmistakable clarity.”109 Our pre-Sims reading of Jackson prompted us to favor express findings on voluntariness,110 for reasons all too well illustrated by the case before us. By my reading of Sims, it is nothing short of an imposition of that wholesome course as a virtual requirement.
The Second Circuit has succinctly outlined the initial steps to be taken in complying with Jackson and Sims where evidence of impaired volition is present:
Once it becomes apparent that the accused’s mental condition is a factor that ought to be looked into in relation to the admissibility of his confession, the trial judge must hold a hearing at which relevant evidence may be offered, including the testimony of experts, from which the court will decide whether the accused was at the time he confessed so mentally ill that he was unable, with intelligence, knowledge and understanding, to relinquish or abandon a known right or privilege which was his; or whether “the confession most probably was not the product of any meaningful act of volition.” If it is found that either of these things is so, the confession must be excluded111
To this I would add, perhaps unnecessarily, that the “unmistakable clarity” mandated in Sims112 can hardly be expected without an express articulation of the court’s factual findings and legal conclusions on voluntariness.
If a district court finds involuntariness, a challenged confession or admission, together with its fruits,113 must be excluded from use at trial.114 If the court makes the converse determination, the confession may, of course, be introduced into evidence. In the latter event, in the federal system, as now required by statute, “the trial judge shall permit the jury to hear relevant evidence on the issue of voluntariness and shall instruct the jury to give such weight to the confession as the jury feels it deserves under all the circumstances.” 115
Having concluded that the District Court did not fully analyze and resolve all aspects of Bernett’s involuntariness claim, I now must examine the Government’s assertion that the failure amounts at most to harmless error.
H. The Impact of the Ruling
The Government’s harmless-error argument is that, in view of Ms. Clark’s *959testimony regarding Bernett’s admissions to her and his own testimony at trial,116 the challenged statement to Officer Schleig was merely cumulative on the question of Bernett’s guilt. Because I find the doctrine of harmless error to be inapplicable here, I would reject this contention.
Prior to the Supreme Court’s decision in Chapman v. California,117 it was open to question whether a defect of constitutional stature in a criminal trial could ever be considered harmless. In Chapman, though recognizing that “harmless-error rules can work very unfair and mischievous results when, for example, highly important and persuasive evidence, or argument, though legally forbidden, finds its way into a trial in which the question of guilt or innocence is a close one,”118 the Court nevertheless concluded that “there may be some constitutional errors which in the setting of a particular case are so unimportant and insignificant that they may, consistent with the Federal Constitution, be deemed harmless, not requiring the automatic reversal of the conviction.”119 Chapman laid down the rule that “before a federal constitutional error can be held harmless, the court must be able to declare a belief that it was harmless beyond a reasonable doubt.”120
So, while conceding the possibility that “some constitutional errors” in the setting “of a particular case” could be so “unimportant and insignificant” as to be innocuous, the Court in Chapman took pains to point out that its prior decisions indicated that “there are some constitutional rights so basic to a fair trial that their infraction can never be treated as harmless error.”121 As an exam-pie, the Court cited Payne v. Arkansas,122 one decision in a long line prohibiting the admission into evidence of coerced confessions.123 A very helpful elucidation of the doctrine which immunizes involuntary confessions from application of the harmless error rule is set forth in Justice Stewart’s concurring opinion in Chapman:
When involuntary confessions have been introduced at trial, the Court has always reversed convictions regardless of other evidence of guilt. As we stated in Lynumn v. Illinois,124 . the argument that the error in admitting such a confession “was a harmless one . . is an impermissible doctrine.” That conclusion has been accorded consistent recognition by this Court. . . . Even when the confession is completely “unnecessary” to the conviction, the defendant is entitled to “a new trial free of constitutional infirmity.” 125
And in a footnote, Justice Stewart further points out:
None of these decisions suggests that the rejection of a harmless error rule turns on any unique evidentiary impact that confessions may have. Haynes v. Washington126 . . specifically contradicts that notion. In addition to the confession found inadmissible by this Court, the defendant in Haynes had given two prior confessions, the admissibility of which was not disputed, and “substantial independent evidence” of guilt existed. The Court accepted the prosecution’s contention that the inadmissible confession played little if any role in the conviction.127
*960My own probe of the law on voluntariness has identified the Court’s several decisions which fully bear out the analysis in Chapman on this point.128 A recurring theme in these opinions is that no matter how much evidence of guilt exists independently of the impermissible confession, its introduction into evidence constitutes a deprivation of due process which can never be labeled “harmless.” 129 Nor do the cases draw any distinction between nontestimonial evidence of guilt and voluntary incrimination from the accused’s own lips for purposes of this exemption from harmless-error doctrine. Thus in Haynes v. Washington,130 although the trial court had admitted without defense objection two voluntary oral statements of the accused “identical in relevant details”131 to a coerced written confession made the following day, the Court staunchly adhered to its traditional refusal to find harmless error.132 I have no alternative but to conclude that despite Bernett’s unchallenged statements to Ms. Clark and despite his own self-defense account at trial, I cannot dispose of his volun-tariness contention on the ground that admission of his remarks to Officer Schleig was harmless error.133
What this court is called upon to do in this case is to discharge the difficult but nonetheless commonplace judicial task of applying available precedents to a situation factually variant from nearly all those to be found in the case reports. This is always demanding, and is never to be undertaken without maximum care and thought. I cannot believe that the constitutional doctrine of voluntariness in criminal confessions would suffer distortion from a holding that where the facts reveal that a suspect is grossly intoxicated at the time he makes an incriminating statement, there should be a specific determination as to whether his reason and will were so impaired by alcohol — just as they might be by drugs, madness, or police-induced coercion- — • that his words were not voluntarily spoken. My research has led me to but few cases holding a statement made under such circumstances inadmissible,134 and to none at all holding such a statement admissible. But the cases I have scrutinized convince me as to the correct path to be taken.
*961IV. THE FAILURE TO CHARGE THE JURY ON THE CHALLENGED ADMISSION
We must now turn our attention to Bernett’s second complaint on appeal: the failure of the District Court to instruct the jury concerning either the voluntariness of, or the weight to be given to, Bernett’s incriminating admission to Officer Schleig. If this omission amounted to prejudicial error, Bernett is entitled to a new trial. My colleagues and I hold unanimously that the omission was error, but in the circumstances was not harmful to Bernett.
The Supreme Court, in its treatment of voluntariness questions, has deemed either of two procedures — the so-called “Massachusetts” rule and the “orthodox” rule — to be constitutionally acceptable for resolving such claims.135 Under both methods, the initial determination as to the admissibility of the contested confession or admission is made by the trial judge outside the presence of the jury.136 Where the judge finds the utterance to be voluntary, it may be admitted along with the evidence which bears on its volitional character.137 Under the Massachusetts procedure, the judge then charges the jurors that they must determine for themselves the vol-untariness of the accused’s statement and must disregard it if they find it involuntary.138 Under the orthodox rule, the jury is simply instructed that the statement must be accorded whatever weight it concludes it deserves in view of all the surrounding circumstances.139
In the past, our circuit followed the Massachusetts rule, with the judge instructing the jury to redetermine the voluntariness question after the judge had initially resolved it, and admonishing the jurors to discount the statement in their deliberations unless they found it voluntary beyond a reasonable doubt.140 However, in 1968 Congress ordained that thenceforth voluntariness determinations in the federal courts must follow the orthodox practice.141 Under the new statute, the trial judge, having satisfied himself that a confession142 is voluntary,
. shall permit the jury to hear relevant evidence on the issue of vol-*962untariness and shall instruct the jury to give such weight to the ctfnfession as the jury feels it deserves under all the circumstances.143
This was the applicable procedure at the time Bernett was tried.
The record before us reflects that the District Court followed neither the Massachusetts nor the orthodox rule in instructing the jury at Bernett’s trial. The charge made no mention whatever of the admission to Officer Schleig, and defense counsel neither, requested the court to instruct the jury on that matter nor objected to its failure to do so. We are mindful of the general rule that “[n]o party may assign as error any portion of the charge or omission therefrom unless he objects thereto before the jury retires. . . ,”144 It is equally clear, however, that we may overlook a lack of objection where the defect in the instructions amounts to plain error affecting substantial rights of the accused145 In view of the unequivocal statutory mandate that an instruction be given as to the weight which might be accorded a confession or admission received in evidence, the omission of the instruction in this case was
error of the plainest sort. A more difficult task is to ascertain whether Bernett suffered such prejudice therefrom that he must be given a new trial.146
The point of departure in distinguishing nonconstitutional errors which are prejudicial from those which are merely harmless is Kotteakos v. United States.147 That decision directs a federal appellate court to base its evaluation of injury not on its own speculation as to whether the accused was guilty, but on a determination of the effect which the error had or reasonably may be taken to have had on the jury’s verdict.148 And if in the end the court is sure that the error did not influence the jury or influenced it but slightly, the verdict should stand “except perhaps where the departure is from a constitutional norm or a specific command of Congress.”149 The quoted language is troubling in view of the fact that the error here consisted in the disregard of a “specific command of Congress.” 150 There are cases wherein misstatements or omissions in jury charges which have deprived accused persons of legislatively conferred rights have resulted in reversal of the conviction on appeal.151 And the implication *963of Kotteakos is that especially close scrutiny for prejudice must be exercised by appellate courts whenever a statutory privilege has been abrogated.
From the outset we bear in mind the important role of jury instructions in the criminal trial. These “vital cogs in the federal judicial machinery”152 supply the jurors with the legal standards upon which the issues submitted to them must be resolved. “On [the] coverage and caliber [of the instructions] depends the integrity of jury verdicts and, in the long run, the worth of the jury system itself.”153 So, “[f]or the very best of reasons, a party is entitled to have the jury instructed on all essential questions of law involved in the case.” 154 Thus courts have reversed convictions where no instruction was given on criminal responsibility in a case presenting an insanity defense;155 where no instruction was given on the limited purpose of prior inconsistent statements introduced to impeach a witness;156 where no instruction was given that a negative inference could not be drawn from the accused’s failure to testify;157 where no instruction was given that a conviction for perjury must be based on the testimony of at least two witnesses or on that of one witness with independent corroboration;158 and, in a Massaehusetts-rule jurisdiction, where no instruction was given on the jury’s duty to redetermine the voluntariness of a confession.159 There are other examples, but these suffice to illustrate the principle, common to them all, that new trials will be granted where the omitted instruction deals with a legal principle of such magnitude that, had the jury considered it, the verdict could have been substantially affected. What we must endeavor to ascertain is the probable impact on the verdict here of the court’s failure to charge the jury concerning the weight to be accorded the statement under review.
At trial, Officer Schleig related that when Bernett was asked his name, he replied, “Jimmy Bernett. I know the police are looking for me because I got in a fight over at 1441 Euclid Street. I hit the man twice with the stool leg, once in the forehead, once behind the head. I think I killed him.”160 Ms. Clark recalled Bernett’s response some*964what differently. According to her, Bernett blurted out his name and told the officer he had killed a man on Euclid Street, and in reply to further questioning related the details of the incident.161 Bernett’s own recollection of the episode was that he gave the officer his name when asked, and added that he knew the police were looking for him because he had hit a man and “they claim he died.” All three witnesses testified that Bernett had consumed a large quantity of alcohol, and Officer Schleig stated flatly that Bernett was drunk.
Whichever of the three versions of Bernett’s incriminating concessions the jury chose to believe, it amounted to little more than a succinct summary of his own testimony at the trial. The only conflict between Bernett’s statement, as variously recounted by the witnesses, and Bernett’s self-defense account was that he claimed he struck his victim once while Officer Schleig said that Bernett acknowledged striking him twice.162 In no material way was Berhett’s testimony contradicted by the substance of the challenged admission. Thus, even if, for lack of a guiding instruction, the jurors mistakenly believed that they were to credit the statement fully, it could hardly have prejudiced the defense which Bernett advanced.
Beyond that, it is of course quite possible, on the other hand, that the jury gave less than full weight or perhaps no weight at all to the statement, even without the benefit of an instruction that they could discount it if they chose.163 From three different witnesses the jurors sitting in judgment on Bernett knew that he was highly intoxicated when he spoke to Officer Schleig. Moreover, the jurors were given the standard charge to “weigh all the evidence in the case.” While this did not call their attention specifically to Ber-nett’s utterances, it nonetheless imposed on them the responsibility to evaluate it just as they would any other piece of evidence.
In sum, it appears that even in the unlikely event that the jury felt bound to accept the challenged statement at face value because they were not instructed that they could give it less weight, we cannot believe that Bernett’s remarks to Officer Schleig worked to the detriment of his defense. And given the general understanding of jurors’ prerogatives, the evidence of Bernett’s drunkenness, and the admonition of the court that then jurors weigh all the evidence, it is improbable that they were unaware of their power to accord less than full weight to the impugned statement, and they may well have chosen to do so. Unable as we are to isolate any real chance that the error committed here substantially affected Bernett’s rights at trial, we must conclude that the court’s failure to instruct the jury as statutorily required was harmless.
V. DISPOSITION
In reviewing this case, we have identified problems as to the District Court’s ruling on the admissibility of Bernett’s oral statement to Officer Schleig. We do not disturb the trial court’s finding that it was made in a noncustodial setting, and a majority of this court is of the view that the voluntariness inquiry properly terminated with that finding, and that the ruling is to be affirmed.164 *965I disagree, and would remand for a determination as to whether Bernett was so intoxicated at the time he made the incriminating statement that it could not be said to be the product of a rational intellect and free will.165 By my approach, if the court should find that the declaration was voluntarily and intelligently given, Bernett’s conviction must be left undisturbed; in the event that a contrary determination should be made, Bernett would become entitled to a new trial at which the statement and its fruits would be excluded.166 My position, however, as stated, does not prevail.
Although we find error in the District Court’s failure to comply with the statutory procedure for charging the jury on the weight to be given a confession, we all conclude that Bernett suffered no prejudice as a result of that omission.167 Consequently, a new trial is not necessitated on that account.
The judgment of conviction appealed from is accordingly
Affirmed.