*908The defendant was convicted of trafficking in cocaine (G. L. c. 94C, § 32E) and of carrying a dangerous weapon in a motor vehicle, to wit, a blackjack (G. L. c. 269, § 10[¿>]). Prior to trial this court affirmed the denial of the defendant’s motion to suppress the cocaine and the blackjack seized during a search of his person and his automobile.
The defendant now challenges the trial judge’s denial of his motion for a new trial without a hearing.1 The principal contention underlying his motion for a new trial is that the affidavit in support of the search warrant contained deliberate falsehoods as to the past reliability of the confidential informant.2 See Commonwealth v. Nine Hundred & Ninety-two Dollars, 383 Mass. 764, 767-768 & nn. 5 & 6 (1981).
Viewing the entire record (which includes the prior proceedings in this court) and acknowledging that the judge properly could determine credibility adversely to the defendant (see Commonwealth v. Smith, 29 Mass. App. Ct. 449, 453-454 [1990]), we think that the judge erred in not allowing oral testimony or some further interrogation of the police affiant. The defendant made a showing that “risefs] to the level of a substantial preliminary showing of intentional falsity ... in the affidavit accompanying the warrant.” Commonwealth v. Ramos, 402 Mass. 209, 215 (1988) (footnote omitted). See Franks v. Delaware, 438 U.S. 154, 155-156, 171-172 (1978). The defendant here, unlike the defendant in Commonwealth v. Ramos, supra, did more than “merely challenge[] the veracity of the police officer’s affidavit by offering his own account of the events in question.” The defendant provided an affidavit from a person, one Steven Nelson,3 claiming to be the anonymous informant (the so-called “IT”), that substantially refuted in material ways statements made by the police affiant.4 At a minimum, the judge should have held an in camera hearing to interrogate the police affiant. See Commonwealth v. Amral, 407 Mass. 511, 522-523 (1990).
In conclusion, we think it appropriate to applaud the professionalism of the Commonwealth for its presentation of a competent, careful, and well-crafted brief and to indicate for the record that the defendant’s brief *909barely reaches the level of appellate argument required by Mass.R.A.P. 16(a)(4), as amended, 367 Mass. 921 (1975).
Kevin P. Curry for the defendant.
Margaret J. Perry, Assistant District Attorney, for the Commonwealth.
The order denying the defendant’s motion for a new trial is vacated, and the matter is to stand for such further proceedings as are warranted in a manner not inconsistent with this opinion.5
So ordered.