Opinion for the Court filed by Circuit Judge GARLAND.
After a jury trial, defendant Andre Clark was found guilty of unlawful possession of a firearm by a convicted felon, unlawful possession of ammunition by a convicted felon, and attempted bribery of a government official. He was sentenced to 90 months in prison on each count, to run concurrently. He challenges his convictions on the following grounds: (1) that the evidence was insufficient to warrant conviction on any count; (2) that the district court abused its discretion and failed to protect him from undue prejudice by permitting the jury to learn of his prior conviction; and (3) that the district court committed a series of prejudicial trial errors. We reject all of these challenges. Clark also contends that he should only have been convicted once rather than twice for unlawfully possessing both a firearm and the ammunition with which it was loaded. The government does not contest this point, and we agree that defendant is correct. Accordingly, we remand for vacation of one of the two possession convictions, and otherwise affirm the district court’s judgment in all respects.
I
Early on the morning of December 11, 1996, police officers Otis McGinnis and Daymeion ■ Harris stopped an automobile that was traveling over 40 miles per hour in a 25 miles per hour zone. Andre Clark was the driver and sole occupant of the car. Officer McGinnis approached the driver’s side window, while Officer Harris went to the passenger’s side. McGinnis asked Clark for his driver’s license and car registration. Clark reached toward the back seat of the car and the back floorboard. Tr. 97-98. After feeling around on the back floorboard, he reached to the back seat and retrieved a document which he handed to the officer. Tr. 111-15. The document was a cellular phone contract in the name of Paul Green. When McGinnis realized what he had been given, he again asked for a license and registration. Tr. 98,113-14. Clark returned the contract to the back seat, felt around again, and pulled out the same cellular contract. Id. Finally, Clark produced an expired learner’s permit from New York which also bore the name Paul Green. Officer McGinnis asked whether defendant had his license, and when Clark said he did not, McGinnis asked him to step out of the car. Tr. 98-100, 116-17. After a radio check disclosed that defendant did not have a valid license, he was placed under arrest for driving without a permit.
Officer McGinnis then began to search the passenger compartment. The first place he looked was under the rear of the driver’s seat, “because that’s where I saw defendant reaching for his registration.” Tr. 101. McGinnis found a loaded .45-caliber handgun on the floor to the rear of the seat, and immediately told his partner. Upon hearing this, Clark said to McGinnis: “I can call my girl right now and give you $5,000.” Tr. 126; see id. at 102-04, 106-08, 140-41. As Officer Harris placed Clark in the squad car, Clark added: “Come on, man. I know what you all really want, I know what you all really want. You all could just go ahead and let me go. I know what you all really want.” Tr 142, 167. Clark also told the officers his name was Paul Green. Tr. 142-43.
Clark was indicted on three counts: (1) unlawful possession of a firearm by a con- *863 vieted felon in violation of 18 U.S.C. § 922(g)(1); (2) unlawful possession of ammunition by a convicted felon, also in violation of section 922(g)(1); and (3) attempted bribery of a government official in violation of 18 U.S.C. § 201(b)(1)(A), (C). At trial, the government offered the testimony of the two police officers as well as a stipulation, entered into by both sides, that Clark “had been previously convicted of a criminal offense punishable by a term of imprisonment exceeding one year.” The nature of Clark’s previous conviction was not mentioned. The defense called Keisha Harling, the mother of Clark’s then-6week-old child and the owner of the car Clark was driving at the time he was arrested. Harling testified that, unbeknownst to Clark, she had purchased the gun from a man in the neighborhood and had left it under the driver’s seat several days prior to the arrest. The defense also called Kevia Williams, a longtime friend of Harling’s, who testified that she saw Har-ling purchase the gun in November 1996 and place it under the driver’s seat in early December. The jury convicted Clark on all three counts.
II
Clark argues that the government lacked sufficient evidence to support the jury’s verdict on either the possession or the bribery charges. We review such a challenge de novo,
United States v. Lucas,
A
Clark’s felon-in-possession charges were based on the theory that he was in constructive possession of the weapon found under his seat.
See United States v. Morris,
Although the case for constructive possession is relatively close, contrary to Clark’s characterization this is not simply a case in which the defendant was found in a car that happened to contain a gun. Nor does the fact that the officers never saw Clark look under the seat establish, as defendant claims, that he did not know it was there. Officer McGinnis testified that Clark felt around on the back floorboard behind his seat, that this made McGinnis suspicious enough to cause him to search that area first, and that when he did he immediately found the gun “where I saw him reaching.” Tr. 101, 115. Clark’s reaching actions are sufficient to link him to the gun and to indicate that “he had some stake” in it — and the fact that it was located directly under his seat further indicates that he had “some power over [it].”
Pardo,
Based on this case law, the officers’ testimony is sufficient to sustain a verdict on the prosecution’s theory: that Clark’s purported effort to reach behind his seat for his license and registration was only a ruse to permit him to push the gun farther out of the officers’ view. This theory is further bolstered by the fact that, as he finally conceded to the officers, Clark had neither document. It is also supported by the fact that the location in which Clark ostensibly searched for the documents, the car’s rear floorboard, would have been an unusual place to store them — even if he had had them.
It is true that there are some inconsistencies between McGinnis’ testimony and that of his partner. McGinnis testified that Clark first reached to the floorboard, and then grabbed the cellular contract from the back seat. Tr. 98. Harris testified that the events occurred in the reverse order. Tr. 137-38. Both, however, were clear that Clark felt around on the floorboard behind the seat. Tr. 115, 138. A more important inconsistency arises from McGinnis’ testimony that Clark ultimately found the expired learner’s permit on the front seat, as compared to Harris’ (somewhat unclear) testimony that it was on the rear floorboard. Tr. 98, 138. • The significance of these inconsistencies, however, was for the jury to assess. Although a reasonable jury might have found the inconsistencies reason to doubt the officers’ credibility, it might also have found them the product of honest differences in recollection, and proof that the officers did not conspire to create a consistent story.
See Gibbs,
The prosecution’s theory of the case is further supported by the testimony of both police officers that, when Clark heard McGinnis had found the gun, he immediately offered McGinnis a bribe. Like the fact that Clark gave the police the alias Paul Green,
see United States v. Glass,
Finally, there was the testimony of Keisha Harling, the mother of Clark’s child, and the partially corroborating testimony of Kevia Williams, Harling’s longtime friend. Harling testified that she had purchased the gun, forgotten it under the driver’s seat several days prior to the arrest, and never told Clark about it. Once again, the assessment of witness credibility is a job for the jury rather than this court.
See Foster,
In sum, viewing the evidence in the light most favorable to the government, we conclude there was sufficient evidence to sustain Clark’s •’ conviction for constructive possession of the gun and its ammunition.
B
Clark also challenges the sufficiency of the evidence supporting his conviction for attempted bribery. Both McGinnis and Harris testified that Clark made the $5,000 offer to McGinnis as soon as he foünd the gun. Harris further testified that Clark made a similar offer to him as he placed Clark in the squad car. Clark did not testify himself, and there was no-other contrary testimony. Nor does Clark contend that the offers were too ambiguous to constitute attempted bribes.
Clark does correctly note that the officers did not record the bribery attempt in their incident reports. He asks us to adopt a per se rule that no prosecution for attempted bribery can reach a jury when the only evidence is the testimony of police officers uncorroborated by contemporaneous reports. As counsel conceded at oral argument, however, there is no authority for -such a rule. Although the officers’ failure to record the incident may call the credibility of their testimony into question, that credibility is for the jury, to assess.
See Foster,
Ill
An element of the offense of unlawful possession of a firearm by a convicted felon is that the defendant be previously convicted of “a crime punishable by imprisonment for a term exceeding one year.” 18 U.S.C. § 922(g)(1). In this case, that element was proven by a stipulation that mirrored the words of the statute, with no mention made of the particular crime involved. Clark contends that the district court abused its discretion and failed to protect him from undue prejudice by permitting the jury to learn of the fact (although not the nature) of his prior conviction through the stipulation. Before trial, Clark moved to sever the felon-in-possession counts from the attempted bribery count, relying on
United States v. Dockery,
In
Dockery,
we overturned a district court’s decision not to sever a felon-in-possession count from others in the indictment.
The most important difference between
Dockery
and this case is that in
Dockery
the evidence of the felon-in-possession count would have been inadmissible in a trial limited to the other counts.
See Dockery,
Of course, even where severance is not required, courts still must “ ‘proceed with caution’ to avoid undue prejudice” to a defendant.
Dockery, 955
F.2d at 53 (quoting
Daniels,
There remains the question of whether it was an abuse of discretion to reject defendant’s suggested alternatives of: (1) bifurcating the trial in a way that would delay the jury’s hearing about his prior felony until after it found him guilty of possessing the gun; or (2) removing the issue from the trial altogether through a stipulation that Clark was a “prohibited person” who was not permitted to possess a weapon. In
Old Chief v. United States,
Needless to say, Clark’s proposals for dealing with his prior conviction go beyond anything required by
Old Chief.
Indeed, in this case the trial court did exactly what
Old Chief
commanded: it accepted the defendant’s stipulation and kept from the jury the name and nature of his prior offense.
Old Chief
did not, and does not, require more. The Court did not even mandate use of a stipulation for every prior offense, but only where “the prior conviction is for an offense likely to support conviction on some improper ground,”
id.
at 191,
Moreover, while the district court’s approach in this case was not unduly prejudicial to defendant, defendant’s alternatives might well have deprived the prosecution of its rightful opportunity, recognized in
Old Chief,
“to convince the jurors that a guilty verdict would be morally reasonable.”
Id.
at 188,
United States v. Bowie,
provides further support for our conclusion. In
Boivie,
the defendant contended that the district court had abused its discretion by failing either to sever his felon-in-possession counts from the other charges, or to bifurcate the felon-in-possession counts so that the jury would decide only the element of possession. We rejected defendant’s challenge, finding that the steps the court had taken to minimize prejudice resulting from mention of the prior conviction “demonstrated sufficiently scrupulous regard for [defendant’s] right to a fair trial.”
Bowie,
The only additional step the trial court took in
Bowie,
but did not take here, was to admonish the jury not to consider the fact of the defendant’s prior conviction for anything other than that element of the felon-in-possession counts. Although the absence of such an instruction is not unimportant, we note that Clark did not request one,
1
and that
Bowie
emphasized there is no “per se rule regarding what steps a district court must take to minimize the prejudice of other crimes evidence.”
Bowie,
IV
Clark alleges that the district court committed a series of other trial errors that prejudiced his right to a fair trial. With one exception, which we discuss in Part V, these arguments are without merit and demand only brief attention to their core allegations.
First, citing
United States v. Donato,
a district judge has wide discretion in monitoring the flow of a criminal trial. It is well within her discretion to rebuke an attorney, sometimes harshly, when that attorney asks inappropriate questions, ignores the court’s instructions, or otherwise engages in improper or delaying behavior. Sharp words spoken by a trial court to counsel do not by themselves establish impermissible bias.
Id. at 434.
In this case, a careful examination of the trial record has not given us any doubt that defendant received a fair trial. In most of the exchanges cited by Clark, the court correctly ruled that defense counsel had failed to properly frame his questions. Sometimes counsel’s questions did not manifest their relevance; sometimes they were leading; and sometimes they suffered from a little of both. When the court sustained a relevance objection, counsel would often try to solve the problem by leading his witness into a show of relevance. This, in turn, would prompt the court to take counsel to task for both problems. See, e.g., Tr. 200.
There is no indication that the court was any tougher on the defense counsel than on the prosecutor with respect to these matters of trial technique.
See, e.g., id.
at 99, 133-34, 139, 165-67, 217, 248. Moreover, the court took care to instruct the jury not to take its rulings on motions or objections by counsel as any indication of its opinion regarding the facts.
2
See Unit
*869
ed States v. Logan,
Clark’s second contention is that the district court erred when it ruled out testimony from Keisha Harling regarding a quarrel she and defendant had shortly before his arrest. We agree that the court erred in concluding such testimony would be irrelevant. While Clark urges the testimony’s relevance on a number of grounds, the argument he stresses, and the one we find persuasive, is that “evidence of hostility between defendant and Ms. Harling was relevant to Ms. Harling’s credibility by tending to counter any inference that she was testifying because of her friendship for defendant.” Def. Br. at 29. Nonetheless, we find the error harmless in that it did not have a “substantial and injurious effect or influence in determining the jury’s verdict.”
Kotteakos v. United States,
Third, Clark contends that the court improperly admitted testimony regarding his use of the alias, Paul Green, and wrongly refused to strike references to the alias from the indictment. Defendant contends that because the alias was “irrelevant for any legitimate purpose,” the testimony should have been excluded under Fed. R. Evid. 401. Def. Br. at 31. But Clark’s alias was not irrelevant. It is well-settled that “[a] defendant’s use of an alias to conceal his identity from law enforcement officers is relevant as proof of consciousness of guilt.”
Glass,
Fourth, Clark argues that he was prejudiced by the court’s improper handling of the fact that a documentary about the jury process was broadcast on CBS television the night after the jury began its deliberations. The next day, defense counsel advised the court of the broadcast, asserted that “there was a definition of reasonable doubt given in that program which is inconsistent with the federal court definition,” and requested that the court voir dire the jurors about the program. Tr. 356. The court declined to conduct a voir dire at that time. Instead, it instructed the jury to disregard anything they might have seen on the program, and then reinstructed them on the proper definition of reasonable doubt. 3 After the jury delivered its verdict, the court conducted a voir dire. Although several jurors had seen at least a part of the broadcast or heard it discussed, all assured the court to its satisfaction that the program had had no impact on their deliberations. Tr. 373-91.
We need not discuss this challenge in detail because defendant has failed, both in the district court and here, to satisfy the threshold requirement for such a claim of improper media exposure: that he show a “likelihood of prejudice.”
United States v. Williams-Davis,
Fifth, Clark argues that the district court “manipulated the jury selection process” by first seating those members of the venire who had been assigned even numbers by the Jury Office’s computer, and thereafter seating odd-numbered members until the complete jury was chosen. Defendant contends that the court’s procedure “infringed his constitutionally guaranteed rights to counsel, due process and equal protection,”
4
although he concedes there is no authority “approving or disapproving the trial judge’s unusual practice.” Def. Br. at 35 & n.16. We do not understand why the court adopted the selection procedure it did, but defendant has been unable to demonstrate how that procedure interfered with his constitutional rights. Although the procedure is unusual, it is not necessarily less random than alternating even- and odd-numbered jurors. Without any evidence to suggest there were relevant differences in the people assigned even and odd numbers, or that the court used the procedure as a mechanism for intentional discrimination, there is no basis for defendant’s claim of a
*871
constitutional violation.
See generally United States v. Ovalle,
V
Clark’s final argument is that he may not be convicted of more than one violation of section 922(g)(1) for possessing both a firearm and the ammunition it contained, an argument he raised in a pretrial motion to compel the government to elect between the two possession counts. Although the government did not respond to this argument on appeal, we note that it has conceded the point in at least three other cases.
See United States v. Pittman,
Because “[t]he legislature remains free under the Double Jeopardy Clause to define crimes and fix punishments,”
Brown v. Ohio,
In
Bell v. United States,
the Supreme Court instructed that “if Congress does not fix the punishment for a federal offense clearly and without ambiguity, doubt will be resolved against turning a single transaction into multiple offenses.”
*872
Upon finding that a defendant has been convicted of two charges for a single offense, the usual remedy is to hold that the convictions have merged and order that one be vacated.
Ball v. United States,
VI
The judgment of the district court is affirmed with the exception of defendant’s separate convictions for unlawfully possessing both a gun and the ammunition with which it was loaded. As to those, the case is remanded with instructions that the district court vacate one of the convictions and resentence the defendant.
Notes
. While the court does have "a continuing obligation to assure a fair trial,” and "appropriate instructions are one way” to do so, "the trial court bears no burden to offer cautionary instructions sua sponte each time pri- or crimes evidence is introduced.” Dockery, 955 F.2d at 56.
. In its closing instructions, the court told the jury that "[m]y actions during the course of *869 this trial in ruling on motions or objections by counsel, any comments I may have made to counsel, any questions I may have put to witnesses ... are not to be taken by you as any indication of my opinion as to how you should determine the issues of fact. If you believe that I have expressed or intimated any opinion as to the facts, not only should you disregard it, I instruct you to totally disregard it.” Tr. 308.
. The court said: "I'm informed by counsel that there may have been some television show last night on the question of reasonable doubt. If there were, and if you saw it ... you must totally disregard it, because it has nothing whatever to do with this case. I am instructing you as to the law as it applies to this case, the case you heard. So, if any of you did happen, to see any such program, please totally disregard it, because it has nothing to do with the law that you are to follow in this case.” Tr. 358-59. The court then repeated the standard federal jury in-struclion regarding the meaning of "reasonable doubt.” Tr. 359-60. See Instruction 2.09, Criminal Jury Instructions, Young Lawyers Section, The Bar Association of the District of Columbia (4th ed.1993).
. Defendant does not challenge the procedure under the Jury Selection and Service Act, 28 U.S.C. § 1861, noting that his failure to raise the issue below renders such a challenge untimely under 28 U.S.C. § 1867(a). Def. Br. at 35 n.16.
.
Accord United States v. Szalkiewicz,
.
See United States v. Dunford,
