SKINNER, District Judge.
These appeals are from convictions on assorted charges of conspiracy, importing and possessing large quantities of marijuana and cocaine, aiding and abetting therein and, in the case of Medina Vazquez, possession of a firearm in connection with the drug charges. These defendants were tried together with two others. This trial was part of the serial prosecution of some 56 members of a large scale drug importation and distribution organization known as “La Nena.” Of their numerous assertions of error, the most serious is the denial of their motions for a mistrial after discovery by the court that four of the jurors had arrived at a conclusion concerning guilt prior to the presentation of the defendants’ evidence. We reserve our discussion of this difficult issue until last.
1. Sufficiency of evidence.
All defendants challenge the sufficiency of the evidence against them because the government’s case depended on the testimony of Geraldo Portalatin Toledo (“Portalatin”), a leading member of the “La Nena” drug organization. Defendants argue that Portalatin’s testimony was so unreliable and so sketchy as to them, that it was insufficient as a matter of law. Portalatin was cross-examined concerning his deals with the government. The judge gave complete and eor-[439]*439rect instructions detailing the special care the jury should take in assessing the testimony of an accomplice. Under these circumstances, an accomplice is a qualified witness and the credibility of the witness is for the jury. United States v. Restrepo-Contreras, 942 F.2d 96, 99 (1st Cir.1991) (it is the province of the jury to assess the credibility of a witness), cert. denied, — U.S. -, 112 S.Ct. 955, 117 L.Ed.2d 123 (1992). Portalatin testified that Ortiz Arrigoitia and Medina Vazquez helped unload various shipments of marijuana and cocaine and Ortiz Cameron participated in the unloading and distribution of a load of cocaine at a “clandestine airfield” at La Furnia Farm in Barceloneta, Puerto Rico. Portalatin’s evidence, if believed, when considered with the other evidence in the case was sufficient to support conviction by the jury, notwithstanding Portalatin’s unsavory history and the contrary evidence presented by the defendants.
2. Improper admission of testimony.
Ortiz Cameron further asserts error in the admission of evidence. Portalatin testified that the driver of a Chevrolet “power wagon” (apparently a four-wheel-drive truck) which was used to remove the cargo of cocaine after an incoming plane crashed at Furnia was “Hiram,” whom he identified as Luis Hiram Ortiz Cameron, the defendant. Portalatin had been in the plane which crashed, had bumped his head, had pulled the pilot out of the plane and had described himself as “shaken” by the experience. Ortiz Cameron argues that Portalatin’s condition made him so unreliable that his testimony should not have been allowed. There is no evidence, however, that he was in any way incapacitated. He pulled the pilot from the plane and helped salvage the cargo. He then spent two hours beside “Hiram” as the latter drove the “power wagon” to the destination of the contraband. Under such circumstances, his credibility was for the jury.
During the cross-examination of Por-talatin, the defense attorney discovered for the first time that Portalatin, during his debriefing by government agents, was shown a picture of Ortiz Cameron. He immediately identified the picture, saying “That’s Hiram.” It does not appear that any suggestive comment was made. This picture was not part of a spread, however, and it was shown to Portalatin in the course of the discussion of his participation in the various drug transactions.
Defense counsel moved that Portalatin’s testimony concerning Ortiz Cameron be stricken as unacceptably tainted. Among other reasons, he asserted that he had not been shown the photograph in question, and that the evidence packet furnished by the prosecution contained copies of photographs which were simply blotches of white on black. The prosecutor replied that all defendants had been invited to the office of the United States Attorney to view all of the government’s hundreds of exhibits, but that none of them had taken advantage of the opportunity. The trial judge made no explicit finding, but apparently accepted the prosecution’s explanation. He offered to suspend the trial, however, to provide defense counsel an opportunity to examine the photo and to develop any evidence of improper suggestion. Counsel declined and proceeded with the cross-examination of Portalatin. Not until eight days later, at the close of all the evidence, did counsel move for a voir dire of Portalatin to explore any possible taint. This untimely motion was denied.
The reliability of identification testimony allegedly tainted by reason of an im-permissibly suggestive photograph should be resolved after consideration of all the circumstances. Manson v. Brathwaite, 432 U.S. 98, 113-14, 97 S.Ct. 2243, 2252-53, 53 L.Ed.2d 140 (1977); United States v. Bouthot, 878 F.2d 1506, 1514 (1st Cir.1989). In this case, it would appear that Portalatin had spent over two hours in the close company of “Hiram,” albeit at night and under difficult circumstances. He knew Hiram’s first name before the photograph was identified.
The district judge’s offer to suspend the trial to permit further investigation was refused. The defendant was doubtless entitled to a voir dire examination of Portalatin before proceeding with the cross-examination, but certainly not eight days later. There was no error in the denial of his untimely motion. Similarly, we find no error in the [440]*440trial judge’s decision to permit Portalatin’s identification to stand.
Ortiz Cameron also alleges error in the admission of testimony concerning his disappearance from his normal whereabouts immediately after the “La Furnia” episode and concerning his wealth, which the government asserted could only be explained by his participation in illicit drug deals over a period of time. The defendant had ample opportunity to rebut such testimony. It is well established that unexplained flight or a defendant’s attempt to conceal his identity may be relevant evidence of guilt. See, e.g., United States v. Grandmont, 680 F.2d 867, 869 (1st Cir.1982). Similarly, evidence of the acquisition of otherwise unexplained wealth may corroborate other evidence of participation in lucrative crimes. United States v. Ariza-Ibarra, 605 F.2d 1216, 1224-25 (1st Cir.1979), cert. denied, 454 U.S. 895, 102 S.Ct. 392, 70 L.Ed.2d 209 (1981).
3. Severance.
All three defendants moved before trial for a severance on the ground that there would be prejudicial “spill-over” of evidence from one to the other. Such a motion is addressed to the sound discretion of the trial judge. United States v. Natanel, 938 F.2d 302, 308 (1st Gir.1991), cert. denied, — U.S. -, 112 S.Ct. 986, 117 L.Ed.2d 148 (1992); United States v. Boylan,
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SKINNER, District Judge.
These appeals are from convictions on assorted charges of conspiracy, importing and possessing large quantities of marijuana and cocaine, aiding and abetting therein and, in the case of Medina Vazquez, possession of a firearm in connection with the drug charges. These defendants were tried together with two others. This trial was part of the serial prosecution of some 56 members of a large scale drug importation and distribution organization known as “La Nena.” Of their numerous assertions of error, the most serious is the denial of their motions for a mistrial after discovery by the court that four of the jurors had arrived at a conclusion concerning guilt prior to the presentation of the defendants’ evidence. We reserve our discussion of this difficult issue until last.
1. Sufficiency of evidence.
All defendants challenge the sufficiency of the evidence against them because the government’s case depended on the testimony of Geraldo Portalatin Toledo (“Portalatin”), a leading member of the “La Nena” drug organization. Defendants argue that Portalatin’s testimony was so unreliable and so sketchy as to them, that it was insufficient as a matter of law. Portalatin was cross-examined concerning his deals with the government. The judge gave complete and eor-[439]*439rect instructions detailing the special care the jury should take in assessing the testimony of an accomplice. Under these circumstances, an accomplice is a qualified witness and the credibility of the witness is for the jury. United States v. Restrepo-Contreras, 942 F.2d 96, 99 (1st Cir.1991) (it is the province of the jury to assess the credibility of a witness), cert. denied, — U.S. -, 112 S.Ct. 955, 117 L.Ed.2d 123 (1992). Portalatin testified that Ortiz Arrigoitia and Medina Vazquez helped unload various shipments of marijuana and cocaine and Ortiz Cameron participated in the unloading and distribution of a load of cocaine at a “clandestine airfield” at La Furnia Farm in Barceloneta, Puerto Rico. Portalatin’s evidence, if believed, when considered with the other evidence in the case was sufficient to support conviction by the jury, notwithstanding Portalatin’s unsavory history and the contrary evidence presented by the defendants.
2. Improper admission of testimony.
Ortiz Cameron further asserts error in the admission of evidence. Portalatin testified that the driver of a Chevrolet “power wagon” (apparently a four-wheel-drive truck) which was used to remove the cargo of cocaine after an incoming plane crashed at Furnia was “Hiram,” whom he identified as Luis Hiram Ortiz Cameron, the defendant. Portalatin had been in the plane which crashed, had bumped his head, had pulled the pilot out of the plane and had described himself as “shaken” by the experience. Ortiz Cameron argues that Portalatin’s condition made him so unreliable that his testimony should not have been allowed. There is no evidence, however, that he was in any way incapacitated. He pulled the pilot from the plane and helped salvage the cargo. He then spent two hours beside “Hiram” as the latter drove the “power wagon” to the destination of the contraband. Under such circumstances, his credibility was for the jury.
During the cross-examination of Por-talatin, the defense attorney discovered for the first time that Portalatin, during his debriefing by government agents, was shown a picture of Ortiz Cameron. He immediately identified the picture, saying “That’s Hiram.” It does not appear that any suggestive comment was made. This picture was not part of a spread, however, and it was shown to Portalatin in the course of the discussion of his participation in the various drug transactions.
Defense counsel moved that Portalatin’s testimony concerning Ortiz Cameron be stricken as unacceptably tainted. Among other reasons, he asserted that he had not been shown the photograph in question, and that the evidence packet furnished by the prosecution contained copies of photographs which were simply blotches of white on black. The prosecutor replied that all defendants had been invited to the office of the United States Attorney to view all of the government’s hundreds of exhibits, but that none of them had taken advantage of the opportunity. The trial judge made no explicit finding, but apparently accepted the prosecution’s explanation. He offered to suspend the trial, however, to provide defense counsel an opportunity to examine the photo and to develop any evidence of improper suggestion. Counsel declined and proceeded with the cross-examination of Portalatin. Not until eight days later, at the close of all the evidence, did counsel move for a voir dire of Portalatin to explore any possible taint. This untimely motion was denied.
The reliability of identification testimony allegedly tainted by reason of an im-permissibly suggestive photograph should be resolved after consideration of all the circumstances. Manson v. Brathwaite, 432 U.S. 98, 113-14, 97 S.Ct. 2243, 2252-53, 53 L.Ed.2d 140 (1977); United States v. Bouthot, 878 F.2d 1506, 1514 (1st Cir.1989). In this case, it would appear that Portalatin had spent over two hours in the close company of “Hiram,” albeit at night and under difficult circumstances. He knew Hiram’s first name before the photograph was identified.
The district judge’s offer to suspend the trial to permit further investigation was refused. The defendant was doubtless entitled to a voir dire examination of Portalatin before proceeding with the cross-examination, but certainly not eight days later. There was no error in the denial of his untimely motion. Similarly, we find no error in the [440]*440trial judge’s decision to permit Portalatin’s identification to stand.
Ortiz Cameron also alleges error in the admission of testimony concerning his disappearance from his normal whereabouts immediately after the “La Furnia” episode and concerning his wealth, which the government asserted could only be explained by his participation in illicit drug deals over a period of time. The defendant had ample opportunity to rebut such testimony. It is well established that unexplained flight or a defendant’s attempt to conceal his identity may be relevant evidence of guilt. See, e.g., United States v. Grandmont, 680 F.2d 867, 869 (1st Cir.1982). Similarly, evidence of the acquisition of otherwise unexplained wealth may corroborate other evidence of participation in lucrative crimes. United States v. Ariza-Ibarra, 605 F.2d 1216, 1224-25 (1st Cir.1979), cert. denied, 454 U.S. 895, 102 S.Ct. 392, 70 L.Ed.2d 209 (1981).
3. Severance.
All three defendants moved before trial for a severance on the ground that there would be prejudicial “spill-over” of evidence from one to the other. Such a motion is addressed to the sound discretion of the trial judge. United States v. Natanel, 938 F.2d 302, 308 (1st Gir.1991), cert. denied, — U.S. -, 112 S.Ct. 986, 117 L.Ed.2d 148 (1992); United States v. Boylan, 898 F.2d 230, 246 (1st Cir.), cert. denied, 498 U.S. 849, 111 S.Ct. 139, 112 L.Ed.2d 106 (1990). Where defendants are indicted in a common conspiracy, there necessarily will be evidence relevant to the charges against more than one defendant, and properly so, since co-conspirators are liable for all of the criminal acts carried out in furtherance of the conspiracy. United States v. Figueroa, 976 F.2d 1446, 1452 (1st Cir.1992). The district judge properly exercised his discretionary power in denying the motion and properly instructed the jury to consider the evidence against each defendant separately.
Defendants Ortiz Arrigoitia and Medina Vazquez renewed their motion after the defendant Ortiz Cameron called Rafael Tormes, a convicted member of the same drug conspiracy, as a witness. On the stand, Tormes testified that Ortiz Cameron had nothing to do with the La Furnia unloading. He did not in any way incriminate Ortiz Arrigoitia or Medina Vazquez. No inconsistent defense was presented. All that occurred was that on cross-examination Tormes corroborated some of the details of Portalatin’s testimony. The prejudice claimed by Ortiz Arrigoitia and Medina Vazquez is that by so doing Tormes bolstered the credibility of Portalatin to their detriment. The defendants have offered no authority in support of the dubious proposition that this entitles them to a mistrial, and we have found none. See United States v. Angiulo, 897 F.2d 1169, 1194-95 (1st Cir.1990) (finding withdrawal/noninvolvement defense insufficiently antagonistic to require severance); United States v. Luciano Pacheco, 794 F.2d 7, 8-10 (1st Cir.1986) (explaining that the degree of antagonism must go beyond mere finger pointing into the realm of fundamental disagreement over core and basic facts); United States v. Talavera, 668 F.2d 625, 630 (1st Cir.) (concluding that antagonistic defenses do not per se require severance, even if the defendants are hostile or attempt to cast blame on each other), cert. denied, 456 U.S. 978, 102 S.Ct. 2245, 72 L.Ed.2d 853 (1982). The district judge properly denied the defendants’ motions for severance and a mistrial.
4. Improper argument.
In the course of his closing argument, the prosecutor said with reference to the defense attorneys, “they want like to scramble your heads, confuse you.” After an objection was overruled, the prosecutor repeated “They wanted to confuse your head.” Later the prosecutor said, “Do not let the attorneys here intimidate you, ladies and gentlemen — .”1 Defense counsel objected. The judge responded by addressing the jury: “I don’t believe that the attorneys for the defendants are intimidating the jurors so — .”
[441]*441In this particular instance we are not persuaded that these comments were so prejudicial as to require reversal. We do not understand, however, why, after numerous warnings from this court, the prosecuting attorneys in the District of Puerto Rico persist in spiking their arguments with comments that put their eases at risk. See, e.g., United States v. Nickens,_ 955 F.2d 112, 120 (1st Cir.1992); United States v. Soto-Alvarez, 958 F.2d 473, 477-78 (1st Cir.1992); United States v. de Leon Davis, 914 F.2d 340, 344-45 (1st Cir.1990).
5. Sentencing errors.
Medina Vazquez argues that the district judge erroneously refused to reduce his offense level by four because of hi's minimal participation. U.S.S.G. § 3B1.2. The comment (n. 2) to the cited section suggests that this reduction should be used sparingly, e.g., in a case where the defendant was engaged in a single off-loading. In this case there was credible evidence that Medina Vazquez had been involved in a number of off-loadings. In the absence of any transcript of the sentencing- hearings in either the record or the supplementary record, we • shall assume that the district judge made appropriate findings of fact. See, e.g., Valedon Martinez v. Hospital Presbiteriano, 806 F.2d 1128, 1135 (1st Cir.1986) (“We have held repeatedly that we will not review a claim of error if the appellant has failed to include a transcript of the pertinent proceedings in the record on appeal.”).
Ortiz Cameron argues that the district judge failed to make sufficiently detailed findings of fact in resolving factual disputes raised by objections to the presentence investigation report (“psi”). In fact, those objections to the psi present in our record on appeal raised no substantial factual issues, except that of guilt, which had already been resolved by the jury. The district judge’s findings were more than adequate under the circumstances.
6. Ineffective assistance of counsel.
Ortiz Cameron alleges ineffective assistance of trial counsel. We have repeatedly held that, absent exceptional circumstances, this claim is not open on direct appeal unless it has been previously raised before the district judge, who is in the best position to make an initial judgment. See, e.g., United States v. Gray, 958 F.2d 9, 15 (1st Cir.1992). This issue was not presented to the district judge, who in fact praised trial counsel for his diligence at one point in the trial.
7. Recusal.
After the trial in this case the trial judge recused himself from the trial of Sonia Berrios Rodriguez, “La Nena,” the purported head of the drug ring, on the grounds of his familiarity with the facts of the case because of previous related trials, of which this was one. Ortiz Cameron claims that this shows that the judge was prejudiced and should have recused himself earlier. In fact the judge was under no obligation to recuse himself from the trial of “La Nena,” but did so as a matter of discretion. In re Allied-Signal Inc., 891 F.2d 967, 970 (1st Cir.1989). Defendant’s argument is frivolous.
8. Motion for mistrial resulting from jury ■ misconduct.
The major controversy in this case swirls around events stemming from allegations of juror misconduct. There are two issues that arise in this context. First, we must decide whether the district court’s finding regarding juror impartiality was clearly erroneous. Second, we must decide whether a remark made by the district court while investigating the question of juror impartiality improperly shifted the burden of proof. While these two questions are factually intertwined in this case, they are analytically distinct, and we therefore consider them seriatim.
A. Background.
At the close of the government’s case, the judge was advised that the daughter of a juror, who had been daily accompanying her mother to the court, had been observed in prolonged conversation with a young woman identified as the girl friend of the defendant Ortiz Cameron. The district judge then interviewed the daughter and her mother, the juror. It appeared from these [442]*442interviews that the juror had discussed the case at length with her daughter, and had expressed very definite views about the testimony of the government’s witnesses. The daughter also reported her understanding from talking with her mother that the jurors had discussed the case among themselves. The juror was then segregated from the other jurors and later excused.
The judge then summoned all of the jurors into chambers, one by one, and asked them the following series of questions:
1. At this point, have you discussed with the jurors or anyone else the guilt or innocence of the defendants?
2. Have you discussed with the other jurors or with anyone the reputation of the defendants?
3. Have you discussed with the other jurors or with anyone else the credibility of any of the witnesses?
4. At this point, have you reached a decision regarding the guilt or innocence of the defendants?
All of the jurors except one answered the first three questions in the negative. One juror said that he thought he had heard some comment about the case but could not remember what it was about. Four jurors, however, answered the fourth question in the affirmative, indicating that they had reached a decision concerning the guilt or innocence of the defendants. The judge then recalled these four jurors, again one at a time, and addressed each one as follows:
As I instructed you before, the guilt or innocence of the defendants is decided after listening to all the evidence, to the final summations of the attorneys and after applying the instructions as to the law to be given by me.
And my question is, would you be able to keep an open mind and in the course of your deliberations with your fellow jurors, re-examine your own views and' change your opinion if convinced it is erroneous?
All four of the jurors answered emphatically in the affirmative. The district judge then declared that he was satisfied that the jurors would carry out their duty properly, based on their answers and his observation of their demeanor.
Counsel for Ortiz Cameron and counsel for Medina Vazquez (and counsel for another defendant whose appeal is not before us) moved for a mistrial. ■ Counsel for Ortiz Arrigoitia expressly declined to so move at that time and joined in the motion only at the very end of the case, just before closing arguments. ’ In response to the judge’s comment, counsel for Ortiz Arrigoitia admitted that he had initially refrained from joining the motion for the purpose of claiming double jeopardy if the motion had been granted without his consent. It is our view that a motion for a mistrial should be made promptly. This was no case of mistake or inadvertence, but one of deliberate delay for tactical purposes. Failure to make a timely motion for mistrial under these circumstances constitutes a waiver and precludes consideration of this issue on appeal with respect to Ortiz Arrigoitia. Cf. United States v. DiPietro, 936 F.2d 6, 9-10 (1st Cir.1991) (inferring waiver of a defendant’s constitutional protection against double jeopardy from silence where the defendant had the opportunity to object but failed to do so until one day later); Grimaldi v. United States, 606 F.2d 332, 339 (1st Cir.) (explaining that where defendant had the opportunity to renew a motion for mistrial for prosecutorial misconduct, but declined to do so, the claim was not preserved, for appeal), cert. denied, 444 U.S. 971, 100 S.Ct. 465, 62 L.Ed.2d 386 (1979); Saville v. United States, 400 F.2d 397, 400 (1st Cir.1968) (concluding that motion for mistrial was untimely where defendant failed to act at the earliest possible opportunity), cert. denied, 395 U.S. 980, 89 S.Ct. 2137, 23 L.Ed.2d 768 (1969).
B. District Court’s Finding.
When a non-frivolous suggestion is made that a jury may be biased or tainted by some incident, the district court must undertake an adequate inquiry to determine whether the alleged incident occurred and if so, whether it was prejudicial. See, e.g., Boylan, 898 F.2d at 258; United States v. Anello, 765 F.2d 253, 259 (1st Cir.), cert. denied, 474 U.S. 996, 106 S.Ct. 411, 88 L.Ed.2d 361 [443]*443(1985); United States v. Corbin, 590 F.2d 398, 400 (1st Cir.1979). The trial judge is not, however, shackled to a rigid and unyielding set rules and procedures that compel any particular form or scope of inquiry. -Rather, in light of the infinite variety of situations in which juror misconduct might be discerned and the need to protect jurors and the jury process from undue imposition, the trial judge is vested with the discretion to fashion an appropriate and responsible procedure to determine whether misconduct actually occurred and whether it was prejudicial. Boylan, 898 F.2d at 258. As we have often explained, “A district court has broad, though not unlimited, discretion to determine the extent and nature of its inquiry into allegations of juror bias.” Corbin, 590 F.2d at 400.
In this case, upon discovering that a juror may have spoken about the trial to her eighteen year-old daughter, the district court immediately summoned the juror and the daughter to chambers for separate interviews -in the presence of all counsel. The juror confirmed that she had spoken to her. daughter about the defendants, but denied that she had talked to the other jurors about the case. The district court promptly segregated the juror and announced his intention to interview individually all jurors to determine if any others had been tainted. The following morning all jurors denied speaking about the case to outsiders or each other, though one thought he had heard some comment among the jurors about the case without identifying what those comments concerned. Counsel were present but were not permitted to participate directly in the interviews; however, the questions posed by the judge to the jurors reflected concerns previously expressed by counsel. Counsel has no right to pose specific questions to a juror or to pursue every desired avenue of inquiry. The control and direction of a court’s investigation into juror' misconduct is within the discretion of the district court, not defense counsel. Corbin, 590 F.2d at 400.
After interviewing all the jurors and relevant third parties, consulting with counsel, and weighing the testimony, demeanor, and credibility of the various parties, the court found the jurors were not partial. The trial court conducted an adequate investigation into the alleged misconduct and reached a reasonable conclusion about the jurors’ impartiality. Ortiz Cameron and Medina Vazquez present no compelling evidence to the contrary and we find nothing in the record that leads us to believe that the district court’s investigation was inadequate or his findings clearly erroneous.2
C. Remark By Judge.
It is also suggested that the district court shifted the burden of proof when it asked the four jurors: “would you be able to keep an open mind and in the course of your deliberations with your fellow jurors, reexamine your own views and change your opinion if convinced it is erroneous?” Although recognizing that the judge’s remark is less than a textbook model, we do not view the language employed, in the specific context of this case, as suggesting that the defendants bore the burden of proving their innocence.
First, the judge’s remark was not an instruction at all but a question asked mid-trial in the context of an investigation we have otherwise held to be sufficient. See supra Part A. Second, the question- — even if somehow deemed to be an instruction — did not place the burden of proof on any specific party but merely asked whether the jurors' retained the ability to reexamine their views in light of further developments. Indeed, the judge scrupulously avoided indicating what particular views he thought the jurors possessed and instead referred only the jurors’ ability to change their “opinion,” whatever it [444]*444might be. Third, again assuming that the question were to be deemed an instruction, the defendants did not give the district court an opportunity to cure it by, at any stage, proposing a sound alternative instruction.
And, finally, assuming the question were an instruction, it must be viewed in the context of the entire jury charge. See Boylan, 898 F.2d at 244; see also Cupp v. Naughten, 414 U.S. 141, 146-47, 94 S.Ct. 396, 400-01, 38 L.Ed.2d 368 (1973) (“a single instruction to a jury may not be judged in artificial isolation”). Here, in his pre-deliberations charge, the judge at least ten times explicitly and directly instructed the jury that the government bore the burden of proof.3 Moreover, the judge himself placed his previous questioning of the jury in context when he stated:
Except for my instructions to you on the law, you should disregard anything I may have said during the trial in arriving at your own findings as to the facts.
Any slight ambiguity created by the mid-trial reference to an “open mind,” then, is adequately dispelled once the “instruction” is viewed in the context of these other, ample instructions.4
We find further support for our conclusion in a fifth factor — circuit precedent. See United States v. Nickens, 955 F.2d 112, 118— 19 (1st Cir.1992). In Nickens the district judge, in his opening charge to the jury and in remarks made to the jury after closing arguments, actually issued an “open mind” instruction very similar to the mid-trial question asked here. In finding that the instruction was not plain error, we held that it “merely told the jury not to evaluate the evidence it would be hearing until the evidence was all in and the court had rendered its instructions.” Id. at 118. We further noted that:
Telling' a jury to postpone making a final judgment until all the evidence has been presented, does not instruct the jury as to the weight or effect that should be given to any aspect of that evidence — nor to the presumption of innocence — when making their final judgment.
Id. at 119. Given this precedent, and given the four case-specific factors we have identified, we find that the remarks made by the district judge did not impermissibly shift the burden of proof.5
Affirmed.