Defendant Belknap, along with three codefend-ants, was convicted of attempted escape (RCW 9.31.010). In 1966, the authorities of the Spokane County jail, in which Belknap was incarcerated, were informed that an attempt to escape was being made. Investigation revealed a partially sawed hole in the metal floor of the common exercise area adjoining the prisoners’ cells. Several pieces of hacksaw blade were found on one of Belknap’s codefend-ants. The jail authorities questioned the inmates, including Belknap, some of whom gave oral and written statements.
A pretrial confession hearing, held pursuant to CrR 101.20W, established the following undisputed facts: (1) after discovery of the attempted escape, a sheriff’s captain had a conversation with Belknap; (2) an undersheriff was present at, but did not participate in, this conversation; (3) the captain informed Belknap of his constitutional rights as required by Miranda v. Arizona, 384 U.S. 436, 16 L. Ed. 2d 694, 86 Sup. Ct. 1602 (1966); (4) Belknap understood his rights; and (5) Belknap was requested to give a written statement which he refused to do.
Other material factual details surrounding this conversation are in dispute. The sheriff’s captain testified that: (1) after being informed of his rights, Belknap stated that he understood them, that he would waive his rights, would answer questions he felt it was wise to answer and would refuse to answer questions he felt it was unwise to answer, unless his attorney would be present; (2) defendant was told that the authorities knew he had not sawed on the floor but that he had sawed on a table brace; (3) Belknap replied that four men were involved in the attempt and *275that he had played his part by sawing on the table brace and acting as a lookout; (4) Belknap was requested to give a written statement; (5) he requested time to consider whether he would do so or whether he would consult his attorney first; (6) Belknap later informed the captain that he would not do so; (7) the captain did not know Belknap had an attorney; (8) Belknap did not request an attorney at any time prior to making the oral admissions; (9) Belk-nap was not told that charges might not be brought if he cooperated. Conversely, Belknap testified that: (1) after being warned of his rights, he told the captain that he would not say anything until he talked with his attorney; (2) he was informed that the captain had learned, from other inmates, of Belknap’s part in the escape; (3) the state might not prosecute if Belknap cooperated; (4) the captain asked if it was true that defendant had sawed on a table brace and acted as a lookout; (5) Belknap replied that he would not answer until after consulting his attorney; (6) Belknap informed the captain of the name of his attorney; (7) Belknap informed the captain that he had no statement to give, written or otherwise. The trial court believed the captain’s version of the disputed facts and ruled that Belk-nap’s alleged admissions were voluntary and admissible.
At trial Belknap renewed his objection to the captain’s testimony as to the admissions, but it was admitted. Independently of the admissions, testimony of other inmates of the jail was that Belknap: (1) indicated to other inmates his participation in the escape attempt; (2) assisted in camouflaging the hole; (3) acted as a lookout; (4) helped other inmates muffle the noise of sawing the hole; (5) sometimes kept the hacksaw blades; and (6) sawed on a portion of a table used as a brace in the escape hole.
Belknap appeals. He first argues that because he denied the captain’s version of the alleged admissions and because an undersheriff who was included in the list of the state’s witnesses was neither called by the state nor his absence explained even though the undersheriff was present during the interrogation, the trial court erred in refusing to instruct the jury on the “missing witness” rule, i.e., the fail*276ure of the state to produce the undersheriff as a witness to verify Belknap’s waiver of his constitutional rights raised an inference that his testimony would have been unfavorable to the state’s case. This rule was defined in Wright v. Safeway Stores, Inc., 7 Wn.2d 341, 346, 109 P.2d 542, 135 A.L.R. 1367 (1941), quoting from 10 R.C.L. 884, § 32, as follows: (cf. 29 Am. Jur. 2d Evidence § 178 (1967))
“ . . . it has become a well established rule that where evidence which would properly be part of a case is within the control of the party whose interest it would naturally be to produce it, and, without satisfactory explanation, he fails to do so, — the jury may draw an inference that it would be unfavorable to him. ...”
In answer to this assignment of error, the state first argues that the failure to call the undersheriff was explained to Belknap’s counsel during a recess of the trial. However, although the state’s explanation appeared in its brief on appeal, there is nothing in the trial record to substantiate this explanation. This court has consistently held that cases on appeal must be decided on the record made in the trial court (Lally v. Graves, 188 Wash. 561, 63 P.2d 361 (1936)) and that we can only consider evidence presented in the record (Falcone v. Perry, 68 Wn.2d 909, 915, 416 P.2d 690 (1966); Tyree v. Gosa, 11 Wn.2d 572, 579, 119 P.2d 926 (1941); Dibble v. Washington Food Co., 57 Wash. 176, 106 Pac. 760 (1910)). Therefore, for the purpose of considering this issue, we must assume that the state’s failure to call the undersheriff was unexplained at the time of trial.
The state next argues that the “missing witness” rule does not apply in the instant case because the under-sheriff was equally available to either party; or stated another way, the rule only applies when the uncalled witness is “peculiarly available” to one of the parties. A witness, however, is not “equally available” merely because he was physically present at the time of trial or could have been subpoenaed by either party. As was said in McClanahan v. United States, 230 F.2d 919, 926 (5th Cir. 1956):
*277. . . “the availability of a witness is not to be determined from his mere physical presence at the trial or his accessibility for the service of a subpoena upon him. On the contrary, his availability may well depend, among other things, upon his relationship to one or the other of the parties, and the nature of the testimony that he might be expected to give . . . .” Deaver v. St. Louis Public Service Co., Mo.App., 199 S.W.2d 83, 85.
For a witness to be “available” to one party to an action, there must have been such a community of interest between the party and the witness, or the party must have so superior an opportunity for knowledge of a witness, as in ordinary experience would have made it reasonably probable that the witness would have been called to testify for such party except for the fact that his testimony would have been damaging. The rationale behind this definition of the “availability” of a witness is aptly summarized in 5 A.L.R.2d 895 (1949), as follows:
If such an inference is to be drawn it becomes necessary to determine which of the parties to the action should have called the witness in order to determine who should bear the onus of the adverse inference or presumption. . . . one of the factors which determines this question is the relationship which the potential witness bears to the parties, the logical inference being that a person will be likely to call as a witness one bound . . . [to] him by ties of interest or affection unless he has reason to believe that the testimony given would be unfavorable, and that a party closely connected with the witness will be more likely to be able to determine in advance what his testimony will be if he is called. On the other hand, a party should not be required to call a witness likely to favor his opponent’s case, since by so doing he must ordinarily vouch for his credibility and lose his opportunity to impeach or cross-examine the witness. (Italics ours.)
We are of the opinion that, under the facts of the case at bar, the uncalled witness was not equally available to either party as argued by the state, but rather was “peculiarly available” to the prosecution as these words are defined above. The uncalled witness was a member of the *278same law enforcement agency as the testifying officer. He was the only other witness to the interrogation. The law enforcement agency of which he was a member was responsible for investigating and gathering all the evidence relative to the charges made against Belknap. The uncalled witness worked so closely and continually with the county prosecutor’s office with respect to this and other criminal cases as to indicate a community of interest between the prosecutor and the uncalled witness.
The state’s next argument is that the missing witness rule does not apply in the instant case because the testimony of the uncalled witness, the undersheriff, would merely have been “cumulative.” The state relies on Wright, supra, in which we said at 347, quoting from 10 R.C.L. 886 § 33: (cf. 29 Am. Jur. 2d Evidence § 186 (1967))
“The presumption arising from a failure to call a witness applies only to witnesses . . . whose testimony would not be trivial, or to be classed as merely cumulative, but important and necessary.”
Similarly, Professor Wigmore has stated in 2 Wigmore, Evidence § 287 (3d ed. 1940):
[I] t seems plain that possible witnesses whose testimony is for any reason comparatively unimportant, or cumulative, or inferior to what is already utilized, might well be dispensed with by a party on general grounds of expense and inconvenience, without any apprehension as to the tenor of their testimony.
But, like all general rules, this limitation on the missing witness rule has its exceptions. Wigmore qualifies this limitation by saying that it depends on the facts of each case for its application and that it “should not be enforced with any strictness; otherwise it would become practically objectionable . . . .” Wigmore, supra, § 287. Wigmore further indicated that, although “it is commonly said . . . that the prosecution’s failure to call an eye-witness is not open to inference” since no rule requires “that all eye-witnesses shall be called;” nevertheless “there can he no such general principle, for sometimes the inference would he well founded.” (Italics ours.) Wigmore, supra, § *279290(1). Had the potential testimony of the undersheriff related to some minor factual issue or even to one of the elements of the crime with which Belknap is charged, we could well accept the state’s argument on this point. However, the disputed issue of fact to which the undersheriff’s testimony would have related — the validity of Belknap’s alleged waiver of his constitutional rights — is one of fundamental importance and hence any testimony relative thereto is clearly not unnecessary, “trivial” or “comparatively unimportant.” The United States Supreme Court in Miranda, supra, warned that where the prosecution has the only means of making available corroborated evidence of such waivers, there is a heavy burden of proof on the prosecution. In the case at bar, the only evidence actually presented by the prosecution was completely contradicted by the defendant; and yet, even though the undersheriff was the only other available source of evidence relative to this dispute, the prosecutor failed to call him as a witness or to explain his absence. We are therefore of the opinion that the inference arising under the missing witness rule, as a result of the prosecution’s failure to call the undersher-iff, is well founded in the instant case.
Finally, the state argues that Belknap failed to make any showing or contention that the testimony of any witness, who could testify as to any material facts, was being willfully withheld, relying on State v. Baker, 56 Wn.2d 846, 859, 355 P.2d 806 (1960), in which we held that
The inference that witnesses available to a party and not called would have testified adversely to such party arises only where, under all the circumstances of the case, such unexplained failure to call the witnesses creates a suspicion that there has been a willful attempt to withhold competent testimony. Wright v. Safeway Stores, Inc., 7 Wn.(2d) 341, 109 P.(2d) 542 (1941), 135 A.L.R. 1367.
See, also, State v. Nelson, 63 Wn.2d 188, 386 P.2d 142 (1963). The holdings in these cases, however, do not mean, as the state seems to imply, that in order to obtain the benefit of the missing witness rule in a criminal case one
*280must prove facts sufficient to establish a deliberate suppression of evidence by the prosecution with knowledge that such evidence, if produced, would support the defendant’s case. Such conduct by the prosecution has, of course, been condemned in both federal and state courts as a denial of due process and thus a ground for the reversal of any conviction resulting therefrom. Brady v. Maryland, 373 U.S. 83, 10 L. Ed. 2d 215, 83 Sup. Ct. 1194 (1963); United States ex rel. Meers v. Wilkins, 326 F.2d 135 (2d Cir. 1964); People v. Fisher, 192 N.Y.S.2d 741 (1958). Rather, the quoted language above simply means that one must establish such circumstances which would indicate, as a matter of reasonable probability, that the prosecution would not knowingly fail to call the witness in question unless the witness’s testimony would be damaging. In other words, “the inference is based, not on the bare fact that a particular person is not produced as a witness, but on his non-production when it would be natural for him to produce the witness if the facts known by him had been favorable.” (Italics ours.) Wigmore, supra, § 286. Proof of such circumstances, unlike proof of a deliberate suppression of material evidence, does not establish a denial of due process, but only gives rise to an inference unfavorable to the prosecution which may be drawn by the jury in its discretion. Considering the heavy burden Miranda1 places on the prosecution to prove the validity of an alleged waiver, the close working affiliation between the prosecutor and the law enforcement agency of which the undersheriff is a member, the sharp conflict between the testimony of Belknap and the only officer actually testifying, and the fact that the undersheriff was the only other person present during the interrogation and therefore the only other source of relevant evidence — we conclude that, in view of the state’s burden under Miranda, Belknap established those circumstances necessary to give rise to the inference of the miss*281ing witness rule and that the trial court erred in failing to so instruct the jury.
In Wright, supra, at 347, we said that when the missing witness rule is applicable the jury should be instructed that they may draw an unfavorable inference against the party failing to call the missing witness, if they believe such inference is warranted under all the circumstances, and should not be instructed that there is a presumption against that party. Nevertheless, we further stated that: “The use of the term ‘presumption’ will not, however, be fatal to the instruction if the context shows that it was used in the sense of an inference which the jury were at liberty to draw.” While we do not commend the language “it may be presumed” as used in Belknap’s proposed instruction, we are of the opinion that such language in the context of the entire instruction may be construed as being “used in the sense of an inference.” Upon retrial, if the state fails to either call the undersheriff or explain his absence, thereby invoking the missing witness rule, Belknap’s proposed instruction would be better phrased if it more closely followed the indications in Wright, as stated above.
Belknap’s second assignment of error is that the court erred in allowing into evidence the captain’s testimony concerning the alleged admission made by Belknap during the interrogation. Belknap’s argument with respect to the admissibility of his alleged admissions in effect involves two distinct questions: (1) did, in fact, Belknap make the alleged admissions; and (2) if so, did he knowingly, voluntarily and intelligently waive his constitutional rights prior to making such admissions, or more precisely, did the prosecution meet its burden of proving such a waiver. We are of the opinion that the first question is simply a disputed question of fact which raises no constitutional issues and to which the Miranda holding with respect to the state’s burden of proof is not applicable. With respect to the second question, Belknap makes two assertions of facts occurring during the pretrial confession hearing which, if true, could render the alleged admission inadmis*282sible under the Miranda holding: (1) The sheriff’s captain allegedly continued the interrogation after Belknap invoked his right to remain silent and his right to counsel. The Supreme Court in Miranda was unequivocal in holding that
The defendant may waive effectuation of these rights, provided the waiver is made voluntarily, knowingly and intelligently. If, however, he indicates in any manner and at any stage of the process that he wishes to consult with an attorney before speaking there can be no questioning. Likewise, if the individual is alone and indicates in any manner that he does not wish to be interrogated, the police may not question him. The mere fact that he may have answered some questions or volunteered some statements on his own does not deprive him of the right to refrain from answering any further inquiries until he has consulted with an attorney and thereafter consents to be questioned, (p. 444)
(2) The sheriff’s captain allegedly indicated to Belknap that charges might not be brought if he cooperated and made a statement. Miranda specifically held that “any evidence that the accused was . . . cajoled into a waiver will, of course, show that the defendant did not voluntarily waive his privilege.” (p. 476) “Cajolery” may be defined as a deliberate attempt at persuading or deceiving the accused, with false promises, inducements or information, into relinquishing his rights and responding to questions posed by law enforcement officers. As already indicated, both of the aforementioned questions involved in Belknap’s argument are sharply disputed and the only available evidence is the conflicting testimony of the accused and one police officer.
In cases prior to Miranda involving a factual dispute, the resolution of which determined the admissibility of a confession or admission, we consistently applied the following rules: (1) where the trial court clearly weighed the conflicting evidence before it, this court on appeal will not disturb the trial court’s determinations, if supported by substantial evidence, as to the admissibility of the statement. State v. Nesrallah, 66 Wn.2d 248, 401 P.2d 968 *283(1965); State v. Burgess, 71 Wn.2d 617, 430 P.2d 185 (1967); (2) “substantial evidence” is defined as that character of evidence which would convince an unprejudiced thinking mind of the truth of the fact to which the evidence is directed. Bland v. Mentor, 63 Wn.2d 150, 385 P.2d 727 (1963); (3) where the trial court has found that the testimony of police officers is entitled to greater credibility than that of the accused and therefore has chosen to believe the officers’ version, the function of this court is not to re-evaluate the relative credibility of the witnesses’ testimony. State v. Reed, 56 Wn.2d 668, 354 P.2d 935 (1960); and (4) while significant weight is attached to the findings of fact relative to the voluntariness of a confession, nevertheless this court has a duty and obligation, where basic constitutional rights are involved, to carefully review the record brought before us and determine therefrom whether the bounds of due process requirements have been exceeded. State v. Hoffman, 64 Wn.2d 445, 392 P.2d 237 (1964).
But for the holding in Miranda, we would have no hesitancy in sustaining the trial court’s findings with respect to both questions involved in Belknap’s second assignment of error according to the rules summarized above as applied in our prior cases. The problem posed in the instant case, however, is what effect, if any, the burden of proof requirement established by Miranda has on these rules as they apply to each of the two questions raised by Belknap’s argument.
The thrust of Miranda is aimed at the state’s burden of proving that the appropriate warnings were given and that the accused effected a valid waiver, and does not apply to the state’s burden of proving that the confession was in fact made. Thus, we do not believe Miranda in any way affects the rules summarized above as they apply to the first question and hence we cannot overturn the trial court’s findings that Belknap did make the alleged admissions.
The second question raised by Belknap’s argument, involves whether or not the prosecution met its burden of *284proving the validity of Belknap’s alleged waiver of his rights. This question is clearly within the scope of the constitutional requirements as defined in Miranda. The issue here is not whether Miranda renders unconstitutional those rules which we have traditionally followed in reviewing a trial court’s findings with respect to the admissibility of an alleged confession or admission; clearly it does not. We recognize that in cases prior to Miranda we were primarily concerned with the voluntariness of a confession, whereas after Miranda, we must, in addition, consider whether the accused was informed of his constitutional rights and whether he thereafter knowingly and intelligently waived those rights prior to making the statement. Nevertheless, the rationale behind these rules prior to Miranda is equally applicable to post-Miranda cases. Neither is the function of this court to retry factual issues or to re-evaluate the credibility of witnesses, nor are we well equipped to do so; and this is particularly true where, as here, the only evidence relative to the factual dispute is the contradictory testimony of two witnesses. As we said in In re Martinson’s Estate, 29 Wn.2d 912, 920, 190 P.2d 96 (1948):
A trial judge is much more than a commissioner named to take and collect evidence in a case. He is a judicial officer provided for by our constitution, and the laws of this state. He has had years of experience as a trial lawyer, and as a judge. . . . The credibility of the witnesses, and the force of their testimony, and the weight that should be attached to it, are all matters concerning which the trial judge is the best judge.
Succinctly stated, the real issue in the instant case is whether, in light of Miranda’s placing a heavy burden of proof on the prosecution, we must now require a greater quantum and quality of proof than we did in pr e-Miranda cases when we apply the “substantial evidence” test upon review of a trial court’s findings as to the validity of an accused’s waiver.
The Supreme Court in Miranda was unequivocal in holding that “a heavy burden rests on the government to dem*285onstrate that the defendant knowingly and intelligently waived his privilege against self-incrimination and his right to retained or appointed counsel.” (Italics ours.) (p. 475) The court was equally clear in expressing its reasons for placing the burden of proof on the prosecution. “Since the State is responsible for establishing the isolated circumstances under which the interrogation takes place and has the only means of making available corroborated evidence of warnings given during incommunicado interrogation, the burden is rightly on its shoulders.” (Italics ours.) (p. 475)
As to the quantum and quality of proof required to prove a valid waiver, Miranda holds that “This Court has always set high standards of proof for the waiver of constitutional rights, Johnson v. Zerbst, 304 U.S. 458 (1938), and we reassert these standards as applied to in-custody interrogation.” (p. 475) In Johnson v. Zerbst, 304 U.S. 458, 464, 82 L. Ed. 1461, 58 Sup. Ct. 1019, 146 A.L.R. 357 (1938), it was stated that “. . . ‘courts indulge every reasonable presumption against waiver’ of fundamental constitutional rights and that we ‘do not presume acquiescence in the loss of fundamental rights.’ ” Moreover, even prior to Miranda it was well established that for the prosecution to meet its burden of proving a valid waiver: (1) “convincing evidence” must be presented, Judd v. United States, 190 F.2d 649 (D.C. Cir. 1951); Nelson v. United States, 208 F.2d 505 (D.C. Cir. 1953); (2) “clear and positive testimony” must be produced, Judd and Nelson, supra; and (3) the government’s burden of proof is greater where the alleged waiver was given while the accused was under arrest, Judd, supra. Some courts have gone even further and required that the trial court must find admissibility beyond a reasonable doubt before the confession may be submitted to the jury. People v. Huntley, 15 N.Y.2d 72, 204 N.E.2d 179 (1965). But see contra, People v. Scott, 29 Ill. 2d 97, 193 N.E.2d 814 (1963); Clifton v. United States, 371 F.2d 354 (D.C. Cir. 1966), cert. denied 386 U.S. 9952, 18 L. Ed. 2d 341, 87 Sup. *286Ct. 1312. The latter view seems to be predominate and. correct.
Furthermore, in accordance with its recognition of the high standards of proof required to prove a valid waiver of constitution! rights, Miranda is emphatic that no presumptions are available to aid the prosecution in its attempt to-prove a valid waiver of the rights to counsel and to remain silent. The court specifically indicates that a waiver will not be presumed: (1) simply from the silence of the accused after the warnings are given (p. 475); (2) simply from the fact that a confession was in fact eventually obtained (p. 475); (3) if the individual answers some questions or gives some information on his own initiative prior to invoking his right to remain silent when interrogated (p. 475); (4) if the accused fails to ask for the assistance of an attorney (p. 470); and (5) from a silent record (p. 475).
Moreover, Miranda specifically points out certain factual criteria which should be considered in determining the validity of a waiver, including the existence of tricks, cajolery, lengthy interrogation, or incommunicado incarceration prior to the waiver, as well as the time interval between the alleged waiver and the giving of a statement.3 But these factual criteria are of little value in determining whether the police in a particular case have followed the mandate of Miranda, if the only proof relative to such criteria is the testimony of one interrogating officer — the very person who allegedly violated the accused’s constitutional rights. If in fact an accused’s waiver is not valid, often his only means of proving the invalidity is his own testimony to that effect.. But a review of cases, in which the issue of the admissibility of a confession had to be resolved on the basis of a ‘swearing contest,” indicates that almost invariably the police officer was held by the trial court to be more credible than the accused. In contrast to the accused’s inadequate means of establishing evidence, the police, when interrogating the accused within the confines of a station house, have *287readily available numerous methods and techniques of establishing corroborating testimony and independent supporting evidence, e.g., (1) the officers, in addition to the interrogating officer, who may witness the accused’s waiver; (2) stenographers; (3) tape recordings; (4) motion pictures; and (5) video tape recordings.
With respect to certain of the factual criteria mentioned in the preceding paragraph, the court in Miranda stated at 476:
Whatever the testimony of the authorities as to waiver of rights by an accused, the fact of lengthy interrogation or incommunicado incarceration before a statement is made is strong evidence that the accused did not validly waive his rights. . . . Moreover, any evidence that the accused was threatened, tricked, or cajoled into a waiver will, of course, show that the defendant did not voluntarily waive his privilege. (Italics ours.)
The language quoted above, particularly as emphasized, has been interpreted by some authorities to mean:
[T]hat confessions achieved by custodial interrogation are regarded with so much distrust by the Miranda justices that something resembling a presumption against their admissibility is taking shape. Though calling this a presumption of police misconduct and perjury might not be accurate, and would doubtless be resented, it should be recognized that the evidentiary problem of proving a valid waiver of Miranda rights is not much different from what it would be if such a presumption existed. 19 Am. Jur. Proof of Facts 72.
See also Justice White’s dissenting opinion, Miranda, supra, at 526; B. James George, Jr., Constitutional Limitations on Evidence in Criminal Cases, Institute of Continuing Legal Education, Ann Arbor, Michigan, 1966, p. 120. While we do not particularly subscribe to this interpretation, we do believe that the Supreme Court intended a mandate to require the adoption of more credible and sophisticated techniques of proof than was formerly the case. So long as interrogation takes place in isolated circumstances, with no one present who is either favorable to the accused or suited for the role of a neutral and impartial observer, some *288firmer guaranty that constitutional rights have been observed will normally be necessary than can be provided by a mere “swearing contest” between the accused and one interrogating police officer.4
Considering the facts as presented in the case at bar, we cannot hold that the prosecution has met the burden of proving the validity of Belknap’s alleged waiver as required by the holding in Miranda: (1) the admission was made while the defendant was in police custody within the confines of the police station; (2) presumably the police had both the opportunity and the means readily available to establish substantial corroborating evidence; (3) the only evidence presented by the prosecution consisted of the testimony of one interrogating officer; (4) the officer’s testimony was neither corroborated by other testimony nor supported by other independent evidence; (5) the officer’s testimony was completely contradicted by the defendant; and (6) a second officer, who was the only other person present during the interrogation, was not called as a corroborating witness by the prosecution nor was his absence explained, and in the instant case this last element may be deemed determinative.
Belknap next makes several assignments of error all relating to the adequacy of the trial court’s instructions relative to the specific intent necessary for the crime of attempted escape. Since we believe these assignments are without merit we will but briefly discuss them. The core of Belknap’s argument on this point is that the jury should have been specifically instructed that intent could not be inferred from an overt act alone.
*289The jury was instructed that they had to find circumstances “such as would authorize them to infer the intent with which the acts were done.” Such circumstances included the evidence, as described earlier, of defendant’s activities in connection with the escape attempt. Reading together the cases of State v. Leach, 36 Wn.2d 641, 219 P.2d 972 (1950), and State v. Lewis, 69 Wn.2d 120, 417 P.2d 618 (1966), relied upon by Belknap and the state, respectively, we can derive the following rule: where a defendant’s acts are patently equivocal, criminal intent may not be inferred from the overt acts alone; however, specific criminal intent may be inferred from the conduct where it is plainly indicated as a matter of logical probability. Considering all the facts and circumstances surrounding the attempted escape, we are of the opinion that Belknap’s conduct was not patently equivocal; rather, his conduct was such that intent could be inferred therefrom as a matter of logical probability. Furthermore, Belknap’s acts were not merely preparation as he contends; the preparation stage had long since passed and the attempt had commenced. Thus, the trial court did not err in refusing to give the instruction requested by Belknap or in giving the instruction which referred to the intent to aid and abet and to the overt acts from which this requisite intent could be found.
Belknap further argues that, because as a prisoner he had no choice but to be immediately present at the scene of the crime, the trial court was in error in instructing the jury that proximity to the scene with others makes the acts of one the acts of each of the others. However, as pointed out by the state, the instruction referred only to persons engaged “in a common criminal escapade” and required the jury to distinguish those prisoners who merely approved of or acquiesced in the attempt from those who aided and abetted and thereby became principals.
As his final assignment of error, Belknap contends that the trial court abused its discretion in denying his motion for a separate trial. Belknap argues that the following circumstances created a danger that the jury would find him *290guilty by association or by the process of elimination: All the defendants were incarcerated in the same confined cell area; someone had unquestionably cut a hole in the jail floor; the interests of the defendants were directly opposed as they all plead not guilty thereby tending to incriminate their codefendants.
The granting of separate trials under RCW 10.46.100 is discretionary with the trial court and this court will not overturn a trial court’s determination except in the case of manifest abuse of discretion. State v. Courville, 63 Wn.2d 498, 387 P.2d 938 (1963). The fact that the interests of all the participants in a crime conflict does not require that the court grant each of several participants a separate trial. Such conflicts invariably will be present “where two or more persons are tried for the same crime . . . .” and if such conflicts are “regarded as requiring a separate trial, it is at once plain that the statute is rendered nugatory, and joint trials will be the exception and not the rule. But such was not the intent of the legislature.” State v. Clark, 156 Wash. 47, 51, 286 Pac. 69 (1930). The trial court did not abuse its discretion in refusing to grant Belknap a separate trial.
Reversed and remanded for new trial.
Finley, C. J., Hunter and Hamilton, JJ., and Ott, J. Pro Tern., concur.