OPINION
A jury found Defendant Nemorio Guzman guilty of conspiracy to possess with intent to distribute 500 grams or more of cocaine, in violation of 21 U.S.C. § 841(a)(1), and for aiding and abetting the possession with intent to distribute 500 grams or more of cocaine, in violation of 18 U.S.C. § 2 and 21 U.S.C. § 841(a)(1). Guzman appeals both his conviction and sentence on the ground that the district court’s voir dire “indoctrinated” the entire panel with a belief that criminal defendants are usually guilty. For the reasons that follow, we AFFIRM.
I.
On September 10, 2003, in Flint, Michigan, a joint team of officers from the Fraser Police Department and the Genesee County Drug Unit executed a search warrant at the residential address of Ernesto Aguilar. The officers recovered a total of four kilograms of cocaine.
Ramon Diaz, a resident of Chicago, was arrested shortly before the search warrant was executed as he and Jose Bustos were leaving the Aguilar residence in Guzman’s vehicle. Guzman was arrested in the backyard of the Aguilar residence. On September 17, 2003, Diaz and Guzman were charged in a multiple count indictment with the illegal possession and distribution of cocaine.
Jury selection in the Guzman case began on July 26, 2004. During voir dire, while the jurors were seated together in the courtroom, the district court asked the potential jurors whether they had any prior personal experience with the criminal justice system. These experiences fell into three general categories: prior jury service, friends or family members who had been arrested, and victims of crime. The potential jurors acknowledged approximately twenty-one specific experiences.
When it received such a response, the district court followed up by asking each individual about the ultimate outcome of those experiences (i.e., conviction or no conviction). Guzman objected approximately seven times, arguing that a response made in front of the entire panel that the defendant in the prior, unrelated case had been convicted could contaminate all potential jurors into believing that most *629 criminal defendants are guilty. The court sustained about half of the objections. For those it overruled or for which there was no objection, the potential jurors responded in front of the venire. In the end, the entire jury pool heard fifteen separate instances of unrelated criminal prosecutions, all but one of which resulted in a conviction.
Following a trial on the merits, the jury found Guzman guilty on both counts.
II.
On appeal, Guzman contends that the nature of the district court’s questioning during voir dire violated his constitutional right to an impartial jury. Specifically, Guzman argues that the potential jurors’ responses to the questions about the guilt of other defendants contaminated the entire venire with a belief that most criminal defendants are guilty.
The Sixth Amendment guarantees an accused the right to be tried “by an impartial jury.” U.S. Const, amend VI. The task of empaneling an impartial jury is left to the sound discretion of the district court, and we review a district court’s voir dire of the jury venire for abuse of that discretion.
1
United States v. Phibbs,
We begin with the well-established presumption of juror impartiality,
see Irvin v. Dowd,
Guzman has presented no evidence of actual juror bias to overcome these presumptions.
See generally Irvin,
Except in the most limited circumstances, none of which are relevant here, “[t]he United States Supreme Court has
not
established any per se rule which it requires trial judges to follow in the voir dire of a jury venire.”
United States v. Blanton,
Rather than a per se rule, district courts are guided by the general standard that voir dire be tailored toward ensuring “a fair trial by a panel of impartial, ‘indifferent’ jurors.”
2
Irvin,
d[o] not constitute an opinion concerning the guilt or innocence of the defendants, nor d[o they] relate to knowledge about facts, parties, or witnesses involved .... Appellant’s suggestion that mere awareness of the adverse consequences of crime induces bias toward the defendant is highly speculative and falls short of the potential actual prejudice which would mandate additional voir dire.
Id.
at 508;
see also United States v. Vargas-Rios,
*631
Nor is there a problem when potential jurors announce their potential biases.
See United States v. Olaseinda,
No. 96-4576,
Even disclosure of the
defendant’s
prior criminal prosecutions does not require a mistrial. For example, in
United States v. Shropshire,
We found only one case where comments by potential jurors not directly related to the defendant in the case at bar
3
rose to the level of presumed prejudicial error, and it bears no resemblance to the facts in this case. In
Mach v. Stewart,
At a minimum, the [trial] court should have conducted further voir dire to determine whether the panel had in fact been infected by [the] expert-like statements. Given the nature of [the] statements, the certainty with which they were delivered, the years of experience that led to them, and the number of times they were repeated, we presume that at least one juror was tainted and entered into jury deliberations with the conviction that children simply never lie about being sexually assaulted.
Id. at 632-33. Critical to the ruling in Mach was the “expert-like” nature of the statements and the fact that the potential juror-“expert” vouched for the credibility of the prosecution’s key witness. The statements were “highly inflammatory and *632 directly connected to [the defendant]^ guilt.” Id. at 634. None of these factors is present in Guzman’s case.
Instead, Guzman’s challenge relies entirely on speculation as to the effect, if any, the potential jurors’ statements had on the actual jurors. Like
Hernandez,
the district court here asked every juror whether there was any reason that he or she would be unable to be impartial and decide the case solely on the evidence presented, and, like
Hernandez,
every juror in this case affirmed an ability to remain fair.'
4
Like
Tegzes,
the statements at issue here did not regard “the guilt or innocence of the defendant! ], nor did [they] relate to knowledge about facts, parties, or witnesses involved.”
Tegzes,
Furthermore, a per se rule would effectively require in camera voir dire of every potential juror in every criminal case. If certain solicited responses have the per se effect of contaminating the venire, we would also have to conclude that similar
volunteered
statements would have the same impact. Experience teaches that potential jurors regularly offer more information than the court or counsel requests. Therefore, trial courts would need to conduct the entire process in camera to prevent the risk of complete venire contamination from innocent, extraneous remarks.
See Mu’Min,
In the event that statements about the guilt of other criminal defendants are not per se prejudicial, Guzman argues that inquiries into the outcomes of unrelated criminal matters are improper as irrelevant. We disagree. One of the primary purposes of voir dire is to aid counsel in their exercise of peremptory challenges.
Mu’Min,
Alternatively, Guzman suggests that this type of questioning be conducted in camera. For the reasons discussed above, there is no need for such precautionary measures. As this Court has stated previously, this approach is an effective and efficient means of empaneling an impartial
*633
jury.
See Phibbs,
In addition, voir dire in front of the entire jury pool may actually result in more effective screening. Potential jurors are often emboldened to be more candid after witnessing other potential jurors’ voir dire. When asked whether they have any personal experiences with the criminal justice system, for example, many are initially reluctant to respond out of embarrassment or self-consciousness until they hear their counterparts admit to similar experiences. Relatedly, hearing the responses of other potential jurors frequently triggers memories of similar experiences that the potential jurors may not have recalled otherwise. Thus, conducting the process before the entire panel can actually lead to more open and thorough voir dire.
In short, Guzman’s proposals are unworkable and contrary to precedent.
III.
The jurors in Guzman’s trial all stated that they were capable of being fair and impartial and of deciding the case solely on the evidence presented at trial. The district court, in its broad discretion, found the jurors to be impartial. There is simply nothing in the record or case law that would allow us to disturb that finding.
The judgment of the ' district court is AFFIRMED.
Notes
. Only those questions to which Guzman objected are reviewed under this standard. Guzman’s complaints about the remaining responses are reviewed for plain error.
See
Fed.R.Crim.P. 52(b);
United States v. Olano,
. Our review reflects the discretion accorded to district courts. As the Supreme Court has stated:
Despite its importance, the adequacy of voir dire is not easily subject to appellate review. The trial judge's function at this point in the trial is not unlike that of the jurors later on in the trial. Both must reach conclusions as to impartiality and credibility by relying on their own evaluations of demeanor evidence and of responses to questions. In neither instance can an appellate court easily second-guess the conclusions of the decisionmaker who heard and observed the witnesses.
Rosales-Lopez v. United States,
. The so-called "publicity” cases are
sui gen-eris,
because they involve knowledge of or statements about the case and defendant on trial. Appellate courts have been slightly more receptive to claims of juror partiality in these contexts.
See, e.g., Rideau v. Louisiana,
. Of course, a prophylactic measure is not required.
See Tegzes,
