Opinion for the Court filed by Circuit Judge THOMAS.
At a joint trial, appellants Keith Harrison, Eric Black and Felando Butler were each convicted of one count of possessing and intending to distribute at least five grams of a mixture of cocaine base, see 21 U.S.C. § 841(a)(1), (b)(l)(B)(iii), and one count of using or carrying a firearm during a drug trafficking offense, see 18 U.S.C. § 924(c)(1). Among other contentions, Harrison challenges the district court’s refusal to sever his trial from those of his code-fendants, Black asserts a violation of his fifth amendment right against self-incrimination, and Butler challenges the sufficiency of evidence underlying his firearms conviction. We affirm each conviction.
I.
On the evening of March 2, 1989, the District of Columbia police stopped a van bearing a temporary license tag identified by the police as stolen. Harrison was driving the van, Black was sitting in the front passenger seat, and Butler was sitting in the rear.
The three men were ordered out of the van and frisked. According to three of the arresting officers, Harrison was carrying an unregistered handgun in a holster clipped to his belt. Harrison also held $595 in cash, including four $100 bills and one $50 bill. In his pants pocket, Black was carrying about 4.5 grams of nearly pure cocaine base, packaged in eighteen individually wrapped plastic bags. Black was also carrying an unregistered handgun in his waistband. Butler was wearing a bulletproof vest underneath his clothing.
The van itself contained several other items of incriminating evidence. In the rear cargo area, behind Butler’s seat, the officers found a gym bag containing over 42 grams of diluted cоcaine base. Also in the rear, they found a temporary license tag with a different number from the one on the tag displayed outside the van. They also found a weapons magazine, which contained pictures of the guns carried by Harrison and Black. On the back seat, next to where Butler had been sitting, they found a bag containing another weapons magazine and two fully loaded ammunition clips. Inside the glove compartment they found the vehicle’s title, issued in March 1988 to a Randolph Stribling and assigned by Stri-bling to Harrison. Stribling later testified that he had never driven the van and that he had signed it over to Harrison to “get it out of my name.”
At trial, the government introduced expert testimony on the significance of this evidence. The government’s expert testi *67 fied that drug dealers commonly use weapons, bulletproof vests, temporary or stolen license tags, and automobiles purchased through others. He testified that drug sales often generate large cash proceeds and that drug dealers do not exрose their operations to third parties unnecessarily. In sum, the expert concluded, the evidence indicated a “street-level distribution network, operating on a mobile basis.”
In their respective defenses, Harrison and Butler each claimed ignorance of the misdeeds attributed to the others. Both testified that Black and Butler were hitchhikers barely known to Harrison. Harrison testified that the bag of drugs belonged to Black or Butler, and Butler testified that it was already in the van when he and Black entered. Harrison and Butler each denied knowing that Black had been carrying a weapon and drugs.
When Harrison sought to call Black to the stand, Black refused to testify, invoking his fifth amendment privilege against self-incrimination. Harrison and Butler each moved to sever their trials from Black’s in order to obtain Black’s testimony. The district court denied both motions.
II.
On appeal, Harrison challenges the district court’s refusal to sever his trial from those of his codefendants. Under rule 14 of the Federal Rules of Criminal Procеdure, a district court “may ... grant a severance” if “it appears that a defendant ... is prejudiced by a joinder of ... defendants.”
1
Because of the rule’s permissive language, as well as “the Government’s strong [administrative] interest in favor of joint trials,”
United States v. Perry,
Harrison challenges the district court’s refusal to sever on the ground that it prevented him from introducing exculpatory testimony by Black, who, Harrison asserts, would have testified on his behalf at a separate trial. This particular claim is governed by
United States v. Ford,
In Ford, we held further that the substance of the codefendant’s testimony must be established with sufficient specificity “to allow the court reasonably to conсlude that the testimony would in fact be ‘sub *68 stantially exculpatory.’ ” Id. (citation omitted). We applied this specificity requirement quite strictly on the facts of Ford itself.
Glenwood Ford arid Timothy Green were jointly convicted of selling PCP to undercover police officer Peter Markland. Mark-land and Green completed the transaction while Ford waited for Green in his nearby automobile. At trial, Ford testified that he was an unwitting accomplice, having merely agreed to give Green a ride because Green was having car trouble оn the night in question. Markland testified against Ford; Green did not testify. Ford moved for a severance, informing the district court that at a separate trial, Green would testify that Ford “had riothing to do with the transaction.” Id. The district court denied the motion, and Ford appealed.
In affirming Ford’s conviction, we held in part that Ford had not identified the substance of Green’s testimony with sufficient specificity. Given the context, we might have indulged an inference that Green, in testifying that Ford “had nothing to do with the transaction,” would simply corroborate Ford’s testimony. Instead, we noted that Green’s testimоny was “not necessarily exculpatory,” because Green might have testified only that Ford was not physically present when the sale was made. See id. (emphasis added). We concluded, therefore, that Ford’s showing “d[id] not provide the specific facts necessary for the District Court to determine that [Ford] ‘w[ould] be unable to obtain a fair trial without severance.’ ” Id. (emphasis added and citation omitted).
In this case, Harrison asserts on appeal that “[t]he substance of ... Black’s testimony would have been ... that Harrison didn’t know that the two hitchhikers he had picked up on a cold night out of a sense of friendship were сarrying drugs and weapons.” Brief for Appellant Harrison at 16. We have little doubt that such testimony, if offered, would be sufficiently important and sufficiently exculpatory to meet the first and third prongs of the prima facie showing required by
Ford.
We find the second prong not met, however, because we can discern nothing in the record from which to conclude that Black’s testi-moriy would have been what Harrison now asserts. After rrioving for a severance, Harrison’s lawyer failed to inform the court of the likely contеnt of Black’s testimony, and Butler’s lawyer asserted only that Black’s testimony would be “significantly exculpatory” (as to Butler). Tr. 526. We think it clear that such “conclusory statements by counsel” are patently insufficient to meet the exacting specificity requirement of
Ford. See
Harrison concedes that he failed to set forth “the nature of [Black’s] testimony ... in great detail”; nonetheless, he argues that “the nature of Black’s testimony was sufficiently obvious” under the circumstances. Brief for Appellant Harrison at 17. Harrison thus invitеs us to infer content from context. As he explains, since “[t]he physical evidence was irrefutable,” Harrison’s only conceivable defense was “the issue of intent.” Given this, he asserts, “[t]he only reasonable inference was that Black was in a position to absolve Harrison of knowledge” of the drug trafficking. Id. at 17-18.
This line
of
reasoning fails to distinguish
Ford
itself. In
Ford,
the physical evidence of drug trafficking was irrefutable, Ford’s only conceivable defense was lack of knowledge of Green’s drug trafficking, and Green was in a position to confirm Ford’s laсk of knowledge, if anyone was. Nonetheless, we refused to infer what the substance of Green’s testimony would have been, even given Ford’s arguably informative statement that Green would have testified that Ford “had nothing to do with the transaction.”
See
Harrison argues that in applying the
Ford
elements to this case, we should draw guidance from analogous decisions in
United States v. Shuford,
Because Harrison has not demonstrated that he failed to receive a fair trial, we find no abuse of discretion in the district court’s denial of his motion for severance. 5
III.
After Harrison’s fourth defense witness finished testifying, Harrison’s lawyer abruptly announced in open court that he “would call Mr. Eric Black at this time.” Tr. 520. Black’s lawyer immediately requested a bench conference, at which he informed the court that Black intended to assert his right against self-incriminatiоn. The court called a recess and announced to the jury that it had to “work out” a “legal problem” with the lawyers. Tr. 521. After the recess, the court informed the jury that “Eric Black will not be [Harrison’s] next witness.” Tr. 531. At the end of the trial, the district court gave a standard instruction informing the jury that “every defendant in a criminal case has the absolute right not to testify” and forbidding it from “draw[ing] any inference of guilt against a defendant because he did not testify.” Tr. 733-34.
Black contends that this sequence violated his rights under the fifth amendment, which prohibits one codefendant from putting another on the witness stand “for the purpose of having him exercise his privilege before the jury.”
Bowles v. United States,
As Black notes, he twice moved for severance at the beginning of the proceedings. Those motions, however, were based on the dubious proposition that the evidence against Harrison was “far more damaging” than the evidence against Black,
see, e.g., United States v. Tarantino,
Because Black failed to preserve his fifth amendment claim below, we consider only whether the district court committed plain error.
See
Fed.R.Crim.P. 52(b).
6
An error is “plain” under rule 52(b) only if it is so obvious that “the trial judge and prosecutor were derelict in countenancing it.”
United States v. Frady,
Black contends that his fifth amendment rights were violated as soon as Harrison announced his intention to call Black as a witness, although the district court vindicated Black’s right not to testify as unobtrusively as possible—without requiring Black to assert it on the stand. 7 *71 We need not decide whether error occurred, because whatever errоr might have occurred was not sufficiently prejudicial to permit a reversal under rule 52(b).
We agree with the government that the case against Black was particularly strong. We recognize that Black’s drug conviction under 21 U.S.C. § 841(b)(l)(B)(iii), which requires possession of at least five grams of cocaine base, cannot be sustained based only on the 4.5 grams of cocaine base that Black was carrying in his pocket. We think, however, that Black’s presence in the van, coupled with undisputed evidencе that he was carrying both drugs packaged for distribution and a weapon, makes out a very strong case for linking him to the drugs behind the back seat. Under these circumstances, we find it highly improbable that Harrison’s brief and unsuccessful attempt to put Black on the witness stand affected the verdict as to Black. Whatever error might have occurred is far too insubstantial to permit reversal under a claim not properly preserved. 8
IV.
Butler contends that the record contains insufficient evidence to support his firearms conviction under 18 U.S.C. § 924(c)(1). When we review a criminal conviction for sufficiency of evidence, of course, we do so very deferentially. We do not determine whether we would find guilt beyond a reasonable doubt, but only whether any reasonable jury
could
find guilt beyond a reasonable doubt.
See, e.g., Jackson v. Virginia,
In pertinent part, section 924(c)(1) provides for punishment of anyone who “uses or carries a firearm” during and in relation to a drug trafficking crime.
9
In order to establish that a defendant “use[d] or carrie[d] a firearm,” the government must prove that the defendant actually or constructively possessed it.
See United States v. Long,
In this case, the jury’s finding that Butler was involved in drug trafficking is supported. The two weapons were readily available to protect that activity, although there is no allegation that Butler actually possessed either of them. The sole question we consider, therefore, is whether the jury could reasonably have found that Butler constructively possessed either of the firearms.
' Our cases frequently have addressed situations involving passengers in motor vehicles аccused of constructively possessing items of contraband found in the vehicles, but not on anyone’s person.
See, e.g., United States v. Gibbs,
The question whether Butler constructively possessed a firearm is more difficult, because the only firearms recovered from the van were found on the persons of Harrison and Black. 12 Other factors being equal, it is less likely that one exercises a right of control over an item physically held by another than over an item in some common аrea readily accessible to all present. Nonetheless, we conclude that the jury could reasonably have found that *73 Butler constructively possessed either or both of the firearms.
All three defendants, the jury found, intended to distribute the cocaine base recovered from the van. Evidently recognizing the hazards of that activity, Butler expected some possibility that he would be shot at while doing so. Since drug dealers are hardly known to be irenically disposed (as evidenced by the weapons, weapons magazines, and ammunition recovered in this case), the jury could reasonably have inferred that when and if Butler was shot at, he would either use one of his confederates’ guns to shoot back, or else instruct one of them to do so. It could have inferred, in other words, that Butler knew he had “some appreciable ability to guide the destiny” of the weapons,
Staten,
V.
We have considered appellants’ various other contentions, and we conclude that they are all without merit. The judgments of conviction are therefore
Affirmed.
Notes
. In its entirety, rule 14 provides:
If it appears that a defendant or the government is prejudiced by a joinder of offenses or of defendants in an indictment or information or by such joinder for trial together, the court may order an election or separate trials of counts, grant a severance of defendants or provide whatever other relief justice requires. In ruling on a motion by a defendant for severance the court may order the attorney for the government to deliver to the court for inspection in camera any statements or confessions made by the defendants which the government intends to introduce in evidence at the trial.
. Once a prima facie showing is made, "the trial court must then: (1) examine the significance of the testimony in relation to the defendant’s theory of the case; (2) assess the extent of prejudice caused by the absence of the testimony; (3) consider the effects on judicial administration and economy; and (4) give weight to the timeliness of the motion.”
Ford,
. Having reviewed the trial transcript, we find no merit in Harrison's contention that the district court failed to give him adequate opportunity to make the necessary showing.
. We reject Harrison’s contention that he made the necessary showing during opening argument, when his counsel promised the jury that the owner of the drugs would absolve Harrison of responsibility. Eight days later, when the severance issue was presented tо the district court, Harrison’s counsel never so much as referred to his opening statement, which had failed to identify Black in any way. Under these circumstances, we cannot fault the court for failing to consider the opening statement in determining whether Harrison had made the necessary showing.
. Harrison briefly suggests that he was also entitled to severance under cases like
United States v. Tarantino,
. Rule 52(b) provides that "[p]Iain errors or defects affecting substantial rights may be noticed although they were not brought to the attention of the court.”
. Although we have never squarely addressed a situation such as this оne, our cases have described the right recognized in
Bowles
as a right not to be forced to the witness stand.
See, e.g., United States v. Pitts,
. Independently of any special fifth amendment problems, severance may be required when defendants rely on "mutually contradictory defenses."
Manner,
. Section 924(c)(1) provides:
Whoever, during and in relation to any crime of violence or drug trafficking crime (including a crime of violence or drug trafficking crime which provides for an enhanced punishment if committed by the use of a deadly or dangerous weapon or device) for which he may be prosecuted in a court of the United States, uses or carries a firearm, shall, in addition to the punishment provided for such crime of violence or drug trafficking crime, be sentenced to imprisonment for five years....
. Our cases have hinted at a distinction between "us[ing]” and "carrfying]” a firearm for purposes of § 924(c)(1), but provide scant guidance as to what that distinction might be.
Compare Long,
. Similarly, Harrison's presence, coupled with the fact that he was driving a van bearing a stolen license tag and with his possession of a large amount of cash and a weapon, was more ■ than sufficient evidence to support a finding connecting him to the drug trafficking activity.
.Although three arresting officers testified that Harrison was carrying a weapon on his belt, Harrison himself testified that the weapon was under the front seat. Conceivably, the jury might have believed Harrison on this point, but convicted him on the theory that he constructively possessed the weapon nonetheless. Because crediting Harrison’s testimony significantly strengthens the case against Butler, the government might have argued that the evidence, viewed in a light most favorable to it, indicates that the weapon was under the seat. Evidently more concerned with preserving Harrison’s firearms conviction, however, the government continues to insist that Harrison was carrying the weapon on his person. See, e.g.. Brief for Appellee at 3, 15, 30.
