Opinion of the Court
EVERETT, Chief Judge:
This appeal concerns the procedure which a military judge should follow when the Government resists a defense request for production of material witnesses on the ground that, ultimately, their direct testimony will have to be stricken because upon cross-examination they will invoke their privilege against self-incrimination. 18 M.J. 150.
I
Contrary to Fisher’s pleas, a special court-martial with enlisted members convicted him of using marijuana on January 15, 1982; possessing and using marijuana on divers occasions in November 1981; false swearing by denial of any involvement with marijuana after January 1981; and possessing cigarette rolling paper on divers occasions during November 1981, contrary to a lawful general regulation, in violation of Articles 134 and 92, Uniform Code of Military Justice, 10 U.S.C. §§ 934 and 892, respectively. However, he was acquitted of using marijuana on October 17, 1981; using marijuana on another occasion in October 1981; communicating a threat; and obstructing justice. The court-martial sentenced appellant to bad-conduct discharge, confinement for 3 months, forfeiture of $367.00 pay per month for 3 months, and reduction to the lowest enlisted grade. The convening authority disapproved the finding regarding cigarette rolling paper but otherwise approved the trial results. The Court of Military Review affirmed. 17 M.J. 768 (1983).
II
The trial of all charges was hotly contested. As to the offenses of which Fisher was convicted, the Government’s evidence tended to show that he possessed and used [359]*359marijuana at an off-base location at various times during November 1981; that he used marijuana when he had celebrated his birthday at a party in an off-base house-trailer on January 15, 1982; and that he falsely swore to a statement to investigators denying involvement with illegal drugs after his completion of a drug rehabilitation program in January 1981.
Fisher’s former girlfriend, Beth Niver, and Airman First Class Floyd Bennett testified that they had been at the January 15 party and had seen appellant, among others, smoking marijuana there. Both also admitted their own drug involvement. Niver also described the November 1981 incidents involving Fisher’s possession and use of marijuana.
Before trial, defense counsel requested the presence of two other persons who had attended the party on January 15. One, Mr. Stricklin, was no longer in the Air Force and had been promised anonymity; but the Government knew of his whereabouts. The other, Airman Leonard, was in confinement at Lowry Air Force Base pursuant to his court-martial sentence. Defense counsel indicated that these witnesses would testify that they had been at the party and had not seen Fisher using marijuana there. Also, Stricklin would testify that he had not seen Fisher use marijuana since January 1981. See Mil.R.Evid. 103(a)(2), Manual for Courts-Martial, United States, 1969 (Revised edition).
Trial counsel acknowledged the relevance of the witnesses’ testimony but, nonetheless, resisted the defense request. He explained that, if the witnesses did testify, he intended to ask them questions on cross-examination which they would refuse to answer on self-incrimination grounds. In support of this revelation, he offered a letter from an area defense counsel which asserted that, if Stricklin and Leonard were “asked about an October 17,1981,15 January 1982, October 1981 or November 1981 use or possession of marijuana, both will assert their Article 31 [, UCMJ, 10 U.S.C. § 831] or 5th Amendment rights on any question which may tend to incriminate them.” Trial counsel indicated that, when the witnesses did invoke these privileges, he would move to strike their direct testimony. See MiLR.Evid. 301(f)(2). Accordingly, he reasoned that there was no need to call them in the first place.
The military judge and both counsel discussed the prosecution’s argument at some length. At one point, defense counsel noted that it was his understanding that Leonard had been tried and acquitted of “the same offense” arising out of the January 15 party as then faced appellant and that, accordingly, “no matter how you slice it, I don’t think that he could claim any privilege. I don’t think there’s any that exists.” Trial counsel responded that, because the party was off-base and, therefore, involved local authorities, Leonard still had a Fifth-Amendment privilege to assert if he wished. Defense counsel replied that the State of Georgia had never tried anyone for possession of marijuana without having the marijuana itself to test —and, of course, as to the party in question, the only evidence of marijuana use was testimony of alleged eyewitnesses.
On another point, defense counsel urged that, because the privilege against self-incrimination was a personal one, the witnesses ought to be called and given the opportunity to assert the privilege, if they chose, rather than have others merely represent that the witnesses would do so. Moreover, defense counsel submitted that, in any event, the military judge could order the witnesses to testify if the answers would, in fact, not be incriminating — but, again, that this could only be ascertained if the witnesses were called.
A discussion ensued as to exactly what trial counsel intended to ask the witnesses on cross-examination and whether these questions would be subject to a privilege not to answer. The prosecutor responded that he intended to ask each witness whether he or she had smoked marijuana at the party. Defense counsel suggested that such a question would not only be incriminating but also irrelevant because it would not go to the witness’ credibility; and he [360]*360indicated that he would object to the question being asked. Of course, if the objection were sustained, any self-incrimination of the witness would probably be avoided.
Before ruling, the military judge inquired of counsel whether he correctly understood their respective positions:
MJ: ... [T]he government feels, I take it, that if they’re coming here to testify, that when you obviously intend to cross-examine them, you will not be able to elicit any information that you feel would somewhat [ajffect their credibility and, therefore, if they rely on their rights, you will ask that I strike their testimony, so what you’re saying is it’s a waste of the government’s time and effort to bring them here?
TC: Yes.
MJ: The defense’s position is notwithstanding the fact that that may very well be so, it may not be so because perhaps it shouldn't be stricken and I can’t rule on that until such time as they testify?
CDC: That’s true and you may not even permit the question.
Ultimately, the judge denied the defense its witnesses, stating:
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Opinion of the Court
EVERETT, Chief Judge:
This appeal concerns the procedure which a military judge should follow when the Government resists a defense request for production of material witnesses on the ground that, ultimately, their direct testimony will have to be stricken because upon cross-examination they will invoke their privilege against self-incrimination. 18 M.J. 150.
I
Contrary to Fisher’s pleas, a special court-martial with enlisted members convicted him of using marijuana on January 15, 1982; possessing and using marijuana on divers occasions in November 1981; false swearing by denial of any involvement with marijuana after January 1981; and possessing cigarette rolling paper on divers occasions during November 1981, contrary to a lawful general regulation, in violation of Articles 134 and 92, Uniform Code of Military Justice, 10 U.S.C. §§ 934 and 892, respectively. However, he was acquitted of using marijuana on October 17, 1981; using marijuana on another occasion in October 1981; communicating a threat; and obstructing justice. The court-martial sentenced appellant to bad-conduct discharge, confinement for 3 months, forfeiture of $367.00 pay per month for 3 months, and reduction to the lowest enlisted grade. The convening authority disapproved the finding regarding cigarette rolling paper but otherwise approved the trial results. The Court of Military Review affirmed. 17 M.J. 768 (1983).
II
The trial of all charges was hotly contested. As to the offenses of which Fisher was convicted, the Government’s evidence tended to show that he possessed and used [359]*359marijuana at an off-base location at various times during November 1981; that he used marijuana when he had celebrated his birthday at a party in an off-base house-trailer on January 15, 1982; and that he falsely swore to a statement to investigators denying involvement with illegal drugs after his completion of a drug rehabilitation program in January 1981.
Fisher’s former girlfriend, Beth Niver, and Airman First Class Floyd Bennett testified that they had been at the January 15 party and had seen appellant, among others, smoking marijuana there. Both also admitted their own drug involvement. Niver also described the November 1981 incidents involving Fisher’s possession and use of marijuana.
Before trial, defense counsel requested the presence of two other persons who had attended the party on January 15. One, Mr. Stricklin, was no longer in the Air Force and had been promised anonymity; but the Government knew of his whereabouts. The other, Airman Leonard, was in confinement at Lowry Air Force Base pursuant to his court-martial sentence. Defense counsel indicated that these witnesses would testify that they had been at the party and had not seen Fisher using marijuana there. Also, Stricklin would testify that he had not seen Fisher use marijuana since January 1981. See Mil.R.Evid. 103(a)(2), Manual for Courts-Martial, United States, 1969 (Revised edition).
Trial counsel acknowledged the relevance of the witnesses’ testimony but, nonetheless, resisted the defense request. He explained that, if the witnesses did testify, he intended to ask them questions on cross-examination which they would refuse to answer on self-incrimination grounds. In support of this revelation, he offered a letter from an area defense counsel which asserted that, if Stricklin and Leonard were “asked about an October 17,1981,15 January 1982, October 1981 or November 1981 use or possession of marijuana, both will assert their Article 31 [, UCMJ, 10 U.S.C. § 831] or 5th Amendment rights on any question which may tend to incriminate them.” Trial counsel indicated that, when the witnesses did invoke these privileges, he would move to strike their direct testimony. See MiLR.Evid. 301(f)(2). Accordingly, he reasoned that there was no need to call them in the first place.
The military judge and both counsel discussed the prosecution’s argument at some length. At one point, defense counsel noted that it was his understanding that Leonard had been tried and acquitted of “the same offense” arising out of the January 15 party as then faced appellant and that, accordingly, “no matter how you slice it, I don’t think that he could claim any privilege. I don’t think there’s any that exists.” Trial counsel responded that, because the party was off-base and, therefore, involved local authorities, Leonard still had a Fifth-Amendment privilege to assert if he wished. Defense counsel replied that the State of Georgia had never tried anyone for possession of marijuana without having the marijuana itself to test —and, of course, as to the party in question, the only evidence of marijuana use was testimony of alleged eyewitnesses.
On another point, defense counsel urged that, because the privilege against self-incrimination was a personal one, the witnesses ought to be called and given the opportunity to assert the privilege, if they chose, rather than have others merely represent that the witnesses would do so. Moreover, defense counsel submitted that, in any event, the military judge could order the witnesses to testify if the answers would, in fact, not be incriminating — but, again, that this could only be ascertained if the witnesses were called.
A discussion ensued as to exactly what trial counsel intended to ask the witnesses on cross-examination and whether these questions would be subject to a privilege not to answer. The prosecutor responded that he intended to ask each witness whether he or she had smoked marijuana at the party. Defense counsel suggested that such a question would not only be incriminating but also irrelevant because it would not go to the witness’ credibility; and he [360]*360indicated that he would object to the question being asked. Of course, if the objection were sustained, any self-incrimination of the witness would probably be avoided.
Before ruling, the military judge inquired of counsel whether he correctly understood their respective positions:
MJ: ... [T]he government feels, I take it, that if they’re coming here to testify, that when you obviously intend to cross-examine them, you will not be able to elicit any information that you feel would somewhat [ajffect their credibility and, therefore, if they rely on their rights, you will ask that I strike their testimony, so what you’re saying is it’s a waste of the government’s time and effort to bring them here?
TC: Yes.
MJ: The defense’s position is notwithstanding the fact that that may very well be so, it may not be so because perhaps it shouldn't be stricken and I can’t rule on that until such time as they testify?
CDC: That’s true and you may not even permit the question.
Ultimately, the judge denied the defense its witnesses, stating:
MJ: Well, based on the proffers, both by the United States as well as the accused and based on the law as I see it at this point, I’m going to deny the request to have these two witnesses brought in to testify, in light of the fact that they apparently, according to again the proffers of the United States, rest on their rights under Article 31 or the Fifth Amendment on matters that the court feels, if asked, would not be collateral and would require that their testimony be stricken.
On appeal from this ruling, the court below “assume[d] arguendo that the military judge abused his discretion in refusing to order the production of the requested witnesses.” The court went on, however, to conclude “beyond a reasonable doubt that the proffered testimony would not have tipped the scales in the accused’s balance. United States v. Richardson, 15 M.J. 41 (C.M.A. 1983); United States v. Hampton, 7 M.J. 284 (C.M.A. 1979); United States v. Lucas, 5 M.J. 167, 168 (C.M.A. 1978).” It did so on the basis of “the content of the proffered testimony and the Government’s key witness.” The court explained:
Both L and S were expected to testify that while present at the parties on 17 October 1981 and 15 January 1982, they did not observe the accused use marihuana. While this expected testimony is material in a collateral sense, it is not essential, for it does not negate the Government’s case____ The fact that L and S did not personally observe the accused use marihuana at the parties does not negate evidence that the accused did, in fact, use marihuana.
United States v. Fisher, supra at 770.
Ill
A
On this appeal, a number of interesting questions have been raised and capably addressed by counsel for both sides. First, were trial counsel’s intended questions, which would have gone to the witnesses’ marijuana use at the party in an effort to lessen their credibility in the court members’ eyes, see MiLR.Evid. 608(b), purely collateral? If so, then the witnesses’ refusal to answer such questions would not be a basis for striking their direct testimony. See United States v. Richardson, supra at 47-48; Mil.R.Evid. 301(f)(2); United States v. Hill, 18 M.J. 459 (C.M.A. 1984).
Second, if, as the record suggests, trial counsel had several alternative means of showing that the witnesses had used marijuana at the party, should the military judge in his discretion, see Mil.R.Evid. 301(f)(2), have required him to utilize those means of attacking the witnesses’ truthfulness rather than striking important defense testimony as the remedy for the witnesses themselves declining to admit their use? See United States v. Richardson, supra at 48. Though use of extrinsic impeachment [361]*361evidence would usually be objectionable, see Mil.R.Evid. 608(b), defense counsel might well have been willing to waive his objection thereto, see Mil.R.Evid. 103(a)(1), in lieu of losing the direct testimony of the defense witnesses, or perhaps the defense would even have stipulated that Leonard and Stricklin were using marijuana themselves.
Third, to the extent that the witnesses’ marijuana use related to their ability to perceive what appellant was doing — as distinguished from their truthfulness1 —should the military judge in his discretion have compelled the Government to use available extrinsic evidence in lieu of asking the witnesses themselves about their use?
Fourth, even if these defense witnesses had been called and had been permitted by the military judge to invoke their self-incrimination protections against cross-examination questions by the prosecutor, would it have been appropriate for the military judge — instead of striking the direct testimony on behalf of the accused — to require the prosecutor to seek testimonial immunity for the witnesses? See United States v. Richardson, supra at 47 n.4. Ancillary to this question is whether a grant of testimonial immunity by a convening authority is sufficient to protect the witness against use of his testimony by a state prosecutor — a question as to which at least one Federal court has found that an affirmative answer “is beyond cavil,” see Terzak v. Usher, 571 F.Supp 1203, 1205 (D. Colo. 1983).2
Fifth, to what extent, if any, is it within the factfinding authority of the Court of Military Review, see Art. 66(c), UCMJ, 10 U.S.C. § 866(c), to weigh testimony which was never given but the existence of which was assumed arguendo and then to conclude that such testimony would not have established a reasonable doubt as to appellant’s guilt?
We shall not address these stimulating issues because we have concluded that, in any event, the military judge erred in not requiring the presence of the two witnesses.
B
At trial, the Government “agreed” that the testimony of the two witnesses would be relevant. See Mil.R.Evid. 401. Now, however, the Government urges that the witnesses were not material and, accordingly, there was no duty to produce them. See United States v. Jefferson, 13 M.J. 1 (C.M.A. 1982); United States v. Roberts, 10 M.J. 308 (C.M.A. 1981).
Materiality of testimony in this regard depends on whether the testimony would “negate the Government’s evidence or ... support the defense.” United States v. Jefferson, supra at 3, quoting United States v. Iturralde-Aponte, 1 M.J. 196,198 (C.M.A. 1975). See United States v. Dorsey, 16 M.J. 1 (C.M.A. 1983). In this connection, the court below reasoned that testimony that the two witnesses had not seen appellant use marijuana at the party would not negate the Government’s evidence that he had in fact used it. See generally United States v. Jefferson, supra (the fact that someone across the hall from the room in which a rape allegedly had occurred heard no scream did not necessarily mean that the victim had not screamed).
Under other factual circumstances, we might agree. Here, however, the party was held in the living room and the kitchen of a small house-trailer — rooms which the [362]*362Government acknowledged in oral argument in this Court were “pretty much adjoining rooms there in the house-trailer.” Accordingly, it becomes much more probable than might otherwise be the case that, if someone among the eight to fifteen participants had used marijuana at the party, the others would have known it — especially when, like appellant, the person in question was the honoree of a birthday party.
While contending that the witnesses’ failure to see Fisher using marijuana did not necessarily mean that he had not used it, the Government conceded in its oral argument that "we don’t really have the facts to determine whether or not it would have been impossible for him to use marijuana and be undetected from the other individuals.” This concession graphically illustrates the problem with ruling on an important matter like this on the basis of speculation and supposition as to what the witnesses might have said. When it is the Government which has opposed development of such important information, the accused cannot be penalized for the deficiencies in the record. See United States v. Rivera, 24 M.J. 156 (C.M.A. 1987).
Under these circumstances, we conclude that testimony of two participants at a party in a small area like this could have negated the government evidence and supported the defense. Accordingly, Stricklin and Leonard were material witnesses.
If the military judge had compelled the witnesses’ attendance in court or for a deposition, he then could have — and should have — permitted their examination by counsel out of the presence of the members. In this way he would have provided an adequate basis to determine the various issues mentioned above. See United States v. Hill, 18 M.J. at 461. Perhaps, if all else failed, the military judge might have concluded that the witnesses’ direct testimony should not be admitted into evidence. However, the judge’s failure to permit the parties to develop the facts precluded him from exercising his discretion in an informed and knowledgeable manner. See Mil.R.Evid. 301(f)(2).
IV
Having decided that the military judge erred in not compelling the attendance of the material witnesses requested by the defense, “[w]e must decide whether ‘evidence in the record of trial demonstrates beyond a reasonable doubt that the unadmitted testimony would not have tipped the balance in favor of the accused and the evidence of guilt is so strong as to show no reasonable possibility of prejudice.’ ” United States v. Jefferson, supra at 4, quoting United States v. Lucas, 5 M.J. 167, 172-73 (C.M.A. 1978).
In determining whether Fisher was prejudiced by the refusal to produce material witnesses, we must take into account that the only substantial evidence of his guilt was the testimony of the government witnesses and that no marijuana was seized. Moreover, these government witnesses were not themselves unblemished; and defense counsel made significant efforts to impeach them. Without the requested witnesses, however, the defense case rested primarily on appellant’s general denial. Under these circumstances, we cannot conclude beyond a reasonable doubt that the two requested witnesses “would not have tipped the balance in favor of the accused and [that] the evidence of guilt” was "so strong as to show no reasonable possibility of prejudice” concerning the conviction for drug use on January 15, 1982.
Airman Leonard’s preferred testimony would only have concerned the party on January 15, and Mr. Stricklin’s testimony that he had not seen Fisher use marijuana since January 1981 is subject to the obvious limitation that appellant might have used it outside his presence. Nonetheless, we do not believe that the prejudice for failing to produce these witnesses related only to the January 15 offense. As to the November offenses, the Government’s case depended on the testimony of Beth Niver. If the evidence provided by Leonard and Stricklin had persuaded the court members that Niver was testifying falsely about the events at the party in January, they might also [363]*363have doubted her veracity with respect to the events in November. In that case, there would have been no choice but to acquit appellant as to that charge as well.
If the failure to produce the requested witnesses affected the findings of guilty as to the marijuana offenses, then inevitably Fisher was also prejudiced as to his conviction of false swearing. His allegedly false statement concerned his abstinence from drug use after January 1981. Apparently, the court-martial’s basis for finding that he had lied in that regard was by reason of his involvement with marijuana in November 1981 and at the party on January 15, 1982. Aside from these incidents and the alleged use of which he was acquitted, there was no basis for finding that he had sworn falsely; so this conviction also cannot stand.
V
The decision of the United States Air Force Court of Military Review is reversed. The findings and sentence are set aside. The record of trial is returned to the Judge Advocate General of the Air Force. A rehearing may be ordered.3
Judge SULLIVAN did not participate.