The appellant, Eric Quesada-Bonilla, appeals his conviction for robbing a post office in San Juan, Puerto Rico. 18 U.S.C. §§ 2, 2114. The government’s key witness, postal clerk Bernardo Arce, testified that on May 3, 1990, at about 3 p.m., a man entered the post office, jumped up on the counter, pointed a gun at him, demanded all the money in the cash register, and left with a bag containing about $2700. Arce positively identified the appellant as that man, as did one other witness, Erin Beni-tez, who caught a glimpse of the fleeing robber as she was entering the post office.
Quesada’s defense was that he was working at a nearby factory at the time of the robbery. He produced a “check out form” from the factory with his name opposite the hour “3:30 p.m.” Since the robbery took place at about 3 p.m., the jury, when convicting him, must have believed that Quesada signed in that space at a different time, or that someone else (perhaps his brother, who also worked at the factory) signed for him or, just conceivably, that he left the factory, robbed the post office, returned to the factory (several minutes drive away) and signed the form by 3:30 p.m. Quesada also produced a very brief “production report” which he claimed he wrote “at the end of the day” (presumably before signing out at 3:30 p.m.). The jury must have found this evidence equally unconvincing, for similar reasons.
Quesada appeals his conviction, complaining primarily of actions by the district judge and by the prosecutor that, he says, prejudiced the jury against him. Since the question before the jury was essentially one of which witnesses to believe, he argues, even subtle forms of prejudice might *599 have proved fatal to his defense. We recognize that an unbiased jury is essential in any criminal proceeding, but we do not believe that the rulings and statements to which Quesada points created unlawful prejudice here. We therefore affirm his conviction. We shall briefly state our reasons.
I
Jury Selection
Quesada argues that the district court’s jury selection process improperly prejudiced the jury. He points out that his panel included two members who had just finished serving in another criminal case, before the same judge, who had selected both juries from the same pool. In the first case, the jury had convicted a defendant whom Quesada’s lawyer also represented. Moreover, after the first conviction, the judge told the first jury that it seemed to him
that with the kind of evidence we had, ... the only solution or alternative was the one you found. Had the case been tried to me without a jury, I don’t think I could have reached any other conclusion.
Quesada adds that the first case (a drug smuggling case) raised the question of whether the defendant had written a name on some baggage tags (rather like the issue of whether Quesada signed out on the check out form or wrote the production report). His lawyer had produced a handwriting expert in that case. The two “overlapping” members who served on his own jury, Quesada argues, may have wondered why his lawyer did not offer a handwriting expert at his trial as well. All this, he says, adds up to unlawful prejudice.
After examining the record, however, we can find no such prejudice. We are aware of no authority that prohibits a court, as a general matter, from empaneling juries for several cases in a single proceeding or using the same jurors in several cases, whether or not the defendants in those separate cases use the same lawyers. Such practices are fairly common in several judicial districts.
See, e.g., United States v. Franklin,
Nor do we believe that the judge’s post-verdict remarks to the first jury created any actual prejudice to Quesada. We recognize that American Bar Association standards say that trial judges are not to comment to the jury on the merits of its verdict. See ABA Standards for Criminal Justice 15-4.6 (2d ed. 1980) (“While it is appropriate for the trial judge to thank jurors at the conclusion of a trial for their public service, such comments should not include praise or criticism of their verdict.”); ABA Standards, The Function of the Trial Judge § 5.13 (Approved Draft 1972) (same); ABA Standards, Trial by Jury § 5.6 (Approved Draft 1968) (same). This Standard was “intended to avoid improper influence in other cases to which the jurors may be assigned,” id. commentary, particularly where “these same jurors may immediately be assigned to decide other pending cases.” ABA Standards for Criminal Justice 15-4.6 commentary. Specifically, it sought to eliminate “the practice of some judges ... to ... comment favorably or unfavorably upon the verdict, for example, that [the jurors] did the right thing in convicting the defendant....” Id. The 1990 ABA Model Code of Judicial Conduct reaffirms this basic principle. See ABA Canon 3 B(10) and commentary (a “judge shall not commend *600 or criticize jurors for their verdict other than in a court order or opinion,” lest doing so “imply a judicial expectation in future cases,” and thereby “impair a juror’s ability to be fair and impartial in a subsequent case.”).
ABA standards and model rules, however, do not automatically set the measure of reversible error in specific cases, particularly where, as here, the case does not present the evils the proposed canon seeks to prevent. Here, the judge’s comments did not “imply” any “judicial expectation.” The judge told the jury he thought it had reached the correct result in that specific case (in the judge’s words) “with the kind of evidence we had. ” This language does not suggest the judge favored convictions or believed that a jury should convict in a different case where the evidence was different. We do not see how the comment could have biased the two members of Quesada’s jury who had served in the preceding trial. And, in the absence of prejudice, any legal error is “harmless.” Fed.R.Crim.P. 52(a).
Neither did the presence of a “handwriting issue” in both cases create actual prejudice. The circumstances of the first case (involving drug smuggling) and Quesada’s case were very different. Moreover, a juror, whether or not he had previously served on a “handwriting case” jury might well think about the possible use of experts to resolve handwriting disputes. That the two overlapping jurors had some special, bias-creating thought about this matter is simply too remote a possibility for us to find that the overlap created prejudice.
Cf. United States v. Morales-Diaz,
II
Judge’s Comments at Trial
Quesada complains about a comment the judge made during the trial. Defense counsel had questioned the postal clerk, Bernardo Arce, at length about a surveillance camera in the post office — a camera that failed to work during the robbery, perhaps because it had no film. At one point counsel turned to the judge and said, “I wish they had had film, your honor.” The judge replied (with sarcasm, according to Quesada), “Well, I am not that sure.” Quesada says this remark led the jurors to think the judge thought Quesada guilty, thereby prejudicing their deliberations.
The following considerations, taken together, convince us that this comment, while best left unsaid, was not reversible error. First, a trial court has broad authority to comment during a trial, and in particular, to comment in a way that will stop the jury from treating a lawyer’s argument as if it were evidence.
Quercia v. United States,
Second, Quesada’s counsel, in a sense, provoked the court’s comment. He spent considerable time questioning Arce about why the camera failed to work — a matter that was irrelevant to the issues before the court. After this extended questioning, the court said,
I don’t think we should go into this any further. The fact is that the camera had no film or not enough film. That is the end of the issue. That is all. We are not judging the U.S. Government for failing to keep film in the camera.
At that point, Quesada’s counsel said, “I wish they had had film, your honor,” a comment which, though legally irrelevant, might have improperly swayed the jury.
See United States v. Young,
Third, the court gave closing instructions that made clear the jury’s obligation to ignore its comment. The judge reminded the jurors that the defendant was “presumed innocent.” He said they were “at liberty to disregard all comments that I have made....” He said that if they thought that he “held an opinion because of ... any intervention that I had, you should get that out of your mind.”
See United States v. Paz Uribe,
Finally, Quesada did not object to the court’s comment at the time. Had he done so, the court might have explained its comment immediately in a way that rendered it completely innocuous. Having failed to object, Quesada can prevail only if the district court made a “plain error.”
See Paz Uribe,
Ill
Prosecutor’s Closing Argument
Quesada complains of a portion of the prosecutor’s closing argument, in which the prosecutor told the jury:
The instructions call for you to give a defendant a fair trial. But the instructions also require that you do justice to Mr. Arce, who was the victim in this case. To Mrs. Erin Benitez, who was walking in the post office with a four year old while a man armed with a .45 was walking out with a bag full of money. That is what you must look at.
Quesada’s counsel immediately objected to these remarks as irrelevant and potentially inflammatory (in defense counsel’s words, because they were “tantamount to calling for sympathy for a victim of a crime and a witness of a crime”).
United States v. Capone,
We have previously pointed out that a comment like the prosecutor’s calls for a new trial, but only if it “was likely to have affected the trial’s outcome, ... or that sanction is needed to deter future prosecu-torial misconduct.”
Capone,
Nor do we find a particular need to require a new trial in this case as a “sanction” to deter future misconduct.
Capone,
IV
Disclosure of Alibi Rebuttal Witness
Quesada says that the government failed to disclose an “alibi rebuttal” witness on time, that is, within ten days after the defense told the government that it intended “to offer a defense of alibi.” Fed. R.Crim.P. 12.1(a), (b). On August 1, 1990, the defense told the government it would rely on an alibi and that defendant’s brother, David, would testify in support. On August 28, the government told the defense that it would introduce, in rebuttal, a polygraph operator who had tested David and found him to be lying. The defense then asked the court to prohibit the operator from testifying, simply and solely because the government had given the defense his name twenty-seven days after the defense notice of alibi, rather than within the ten days that Rule 12.1 specifies. The court denied this request, and the defense decided not to have David testify. Quesa-da now argues the court should have granted the request.
Quesada is right about the duty that Rule 12.1 imposes. The Rule says, in relevant part, that, after the defense tells the government that it will rely on an alibi and gives the government the names and addresses of its alibi witnesses, then
[wjithin ten days thereafter, ... the government shall serve upon the defendant ... a written notice stating the names and address of the witnesses upon whom the government intends to rely to ... rebut testimony of any of the defendant’s alibi witnesses.
Id. 12.1(b).
Quesada is wrong, however, about what the court must do when the government violates the Rule. Under the heading “Failure to Comply” the Rule says,
Upon the failure of either party to comply ..., the court may exclude the testi *603 mony of any undisclosed witness offered by such party....
Id.
12.1(d) (emphasis added). The word “may” means that the court need not exclude the testimony. And, case law makes clear that trial courts have considerable leeway in deciding how to respond to a violation of the Rule.
See United States v. Devin,
In this case, Quesada knew about the existence of the witness from the very beginning of the case. Moreover, a brief continuance would apparently have cured any harm caused by the relatively short delay, yet Quesada did not ask for a continuance.
See United States v. Osorio,
Quesada, in his appellate brief, adds another argument. He says that the government failed to disclose, in response to a discovery request, the record of the polygraph examination administered to David. For this additional reason, he says, the district court should have told the government that the operator could not testify.
See
Fed.R.Crim.P. 16(a)(1), (d)(2) (outlining evidence which government has duty to disclose, upon request from defendant, and court’s discretionary authority to exclude improperly undisclosed evidence). As we read the record, however, Quesada did not make this argument in the district court, and therefore has waived the argument.
United States v. Carrasquillo-Plaza,
For these reasons, the judgment of the district court is
Affirmed.
