KANNE, Circuit Judge.
Andrea Hall and Richard Magnant were convicted of conspiring to possess and dis[1037]*1037tribute cocaine. They1 appeal from their conviction alleging that: (1) the district court improperly instructed the jury on a definition of “reasonable doubt;” (2) the trial court committed prejudicial error by instructing the jury that trial witnesses are assumed to speak the truth; (3) the government engaged in intentional misconduct by obtaining an affidavit which was allegedly “filed in camera; ” and (4) the trial court erred in disallowing the impeachment of a non-testifying co-conspirator.
We find that under the circumstances of this case, the instructions given by the court did not prejudice the defendants. Moreover, because we agree with the district court’s ruling with respect to the suppression of certain impeachment evidence and the admissibility of the affidavit filed by defendant Hall, we affirm the defendants’ convictions.
A. BACKGROUND
Defendants Hall and Magnant, along with several other co-defendants, were in-dieted for participating in a conspiracy to distribute and sell cocaine. Hall and Mag-nant were ultimately convicted of possessing cocaine with the intent to distribute and distributing cocaine in violation of 21 U.S. C. § 846. The evidence at trial was that co-defendant Sam Sarcinelli headed a large drug distribution operation, obtaining cocaine in Florida and distributing it in California, Chicago, and New York. Co-defendant Larry Bradi, a former Chicago police officer, operated Sarcinelli’s drug distribution business in Chicago. Hall was Bradi’s girlfriend and an active participant in Bradi’s organization. She made several telephone contacts and engaged in transactions involving cocaine. Specifically, Hall collected money and delivered the cocaine. In addition, Hall accompanied Bradi to Los Angeles to pick up cocaine from Sarcinelli. Hall also kept written records of the amounts of cocaine distributed to Bradi’s dealers and the amounts of money received.
Magnant was also in Bradfs employ. It appears he was involved with the enforcement branch of the operation and in particular, with collecting a debt owed to Bradi by several of his sub-dealers. Magnant became a go-between between Bradi and his dealers. Magnant also accompanied another co-defendant to Los Angeles to obtain cocaine.
B. THE APPEAL ■
On appeal, Hall and Magnant do not challenge the sufficiency of the evidence against them. Rather, they seek a reversal of their convictions on the basis of several of the court’s jury instructions. In addition, Hall and Magnant also challenge several of the court’s rulings.
1. Reasonable Doubt Instruction
First, both defendants challenge the district court’s use of its reasonable doubt instruction.2 Citing United States v. Lawson, 507 F.2d 433 (7th Cir.1974), cert. denied, 420 U.S. 1004 (1975), Hall and Mag-[1038]*1038nant argue that this court has said that “because of the problems of defining reasonable doubt,” no instruction defining reasonable doubt should be given. Moreover, defendants state that in United States v. Martin-Trigona, 684 F.2d 485 (7th Cir.1982) this court:
... admonished district courts not to define reasonable doubt. We advise against defining reasonable doubt because often the definition engenders more confusion than does the term itself. We trust that no instruction defining reasonable doubt will be given on remand.
684 F.2d at 493 (citations omitted).
Hall and Magnant say that the district court not only impermissibly instructed on reasonable doubt, but in doing so, also watered down the constitutional requirements of reasonable doubt. They argue that the court’s instruction equated reasonable doubt to fair doubt, thereby diminishing the constitutional requirement that a defendant be convicted only if each element has been proved beyond a reasonable doubt. Hall and Magnant maintain that the court’s impermissible instruction mandates a reversal of their convictions.
In response, the government concedes that this court has indeed admonished the district courts not to define reasonable doubt. However, the government argues that we have never reversed a conviction simply because the trial court attempted to define reasonable doubt. Although, a reasonable doubt definition at some point may become so incomprehensible that it is prejudicial, the government argues that this is not the ease here. In support of its argument, the government cites to a number of eases wherein this court has ruled that although the reasonable doubt instruction given was objectionable, no reversal was warranted. The government argues the instruction given in this instance does not rise to the level of those objectionable reasonable doubt instructions and, therefore, that no reversal is required here.
We have had numerous occasions to consider the propriety of instructing on a definition of reasonable doubt. In Lawson, supra, we held that the refusal to instruct on reasonable doubt even where an acceptable instruction has been offered, is not reversible error. In so ruling, this court reasoned that defining reasonable doubt is often more confusing than illuminating. 507 F.2d at 443. In United States v. Marquardt, 786 F.2d 771, 785 (7th Cir.1986), in which we affirmed our decision in Lawson, we held that a failure to define reasonable doubt is not prejudicial. However, our rulings in Lawson and Marquardt left open the question whether it is a reversible error to give a jury any definition of reasonable doubt, the very issue presented here.
Although we have decried the use of instructions which attempt to define reasonable doubt, Martin-Trigona, 684 F.2d at 493; United States v. Allen, 596 F.2d 227, 230 (7th Cir.), cert. denied, 444 U.S. 871, 100 S.Ct. 149, 62 L.Ed.2d 97 (1979), we have also held that defining reasonable doubt will constitute reversible error only where the instruction is misleading or confusing. United States v. Regilio, 669 F.2d 1169, 1178 (7th Cir.), cert. denied, 457 U.S. 1133, 102 S.Ct. 2959, 73 L.Ed.2d 1350 (1982). Thus, although defining reasonable doubt has not constituted a per se reversible error, we have held that any confusion engendered by such a definition may indeed create error.
The instruction given in this case does equate “reasonable doubt” with “fair doubt” and defines a fair doubt as one “based on reason and common sense.” Was that language confusing, thereby im-permissibly diminishing the government’s burden of proof? In United States v. Wright, 542 F.2d 975 (7th Cir.1976), cert. denied, 429 U.S. 1073, 97 S.Ct. 810, 50 L.Ed.2d 790 (1977); United States v.
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KANNE, Circuit Judge.
Andrea Hall and Richard Magnant were convicted of conspiring to possess and dis[1037]*1037tribute cocaine. They1 appeal from their conviction alleging that: (1) the district court improperly instructed the jury on a definition of “reasonable doubt;” (2) the trial court committed prejudicial error by instructing the jury that trial witnesses are assumed to speak the truth; (3) the government engaged in intentional misconduct by obtaining an affidavit which was allegedly “filed in camera; ” and (4) the trial court erred in disallowing the impeachment of a non-testifying co-conspirator.
We find that under the circumstances of this case, the instructions given by the court did not prejudice the defendants. Moreover, because we agree with the district court’s ruling with respect to the suppression of certain impeachment evidence and the admissibility of the affidavit filed by defendant Hall, we affirm the defendants’ convictions.
A. BACKGROUND
Defendants Hall and Magnant, along with several other co-defendants, were in-dieted for participating in a conspiracy to distribute and sell cocaine. Hall and Mag-nant were ultimately convicted of possessing cocaine with the intent to distribute and distributing cocaine in violation of 21 U.S. C. § 846. The evidence at trial was that co-defendant Sam Sarcinelli headed a large drug distribution operation, obtaining cocaine in Florida and distributing it in California, Chicago, and New York. Co-defendant Larry Bradi, a former Chicago police officer, operated Sarcinelli’s drug distribution business in Chicago. Hall was Bradi’s girlfriend and an active participant in Bradi’s organization. She made several telephone contacts and engaged in transactions involving cocaine. Specifically, Hall collected money and delivered the cocaine. In addition, Hall accompanied Bradi to Los Angeles to pick up cocaine from Sarcinelli. Hall also kept written records of the amounts of cocaine distributed to Bradi’s dealers and the amounts of money received.
Magnant was also in Bradfs employ. It appears he was involved with the enforcement branch of the operation and in particular, with collecting a debt owed to Bradi by several of his sub-dealers. Magnant became a go-between between Bradi and his dealers. Magnant also accompanied another co-defendant to Los Angeles to obtain cocaine.
B. THE APPEAL ■
On appeal, Hall and Magnant do not challenge the sufficiency of the evidence against them. Rather, they seek a reversal of their convictions on the basis of several of the court’s jury instructions. In addition, Hall and Magnant also challenge several of the court’s rulings.
1. Reasonable Doubt Instruction
First, both defendants challenge the district court’s use of its reasonable doubt instruction.2 Citing United States v. Lawson, 507 F.2d 433 (7th Cir.1974), cert. denied, 420 U.S. 1004 (1975), Hall and Mag-[1038]*1038nant argue that this court has said that “because of the problems of defining reasonable doubt,” no instruction defining reasonable doubt should be given. Moreover, defendants state that in United States v. Martin-Trigona, 684 F.2d 485 (7th Cir.1982) this court:
... admonished district courts not to define reasonable doubt. We advise against defining reasonable doubt because often the definition engenders more confusion than does the term itself. We trust that no instruction defining reasonable doubt will be given on remand.
684 F.2d at 493 (citations omitted).
Hall and Magnant say that the district court not only impermissibly instructed on reasonable doubt, but in doing so, also watered down the constitutional requirements of reasonable doubt. They argue that the court’s instruction equated reasonable doubt to fair doubt, thereby diminishing the constitutional requirement that a defendant be convicted only if each element has been proved beyond a reasonable doubt. Hall and Magnant maintain that the court’s impermissible instruction mandates a reversal of their convictions.
In response, the government concedes that this court has indeed admonished the district courts not to define reasonable doubt. However, the government argues that we have never reversed a conviction simply because the trial court attempted to define reasonable doubt. Although, a reasonable doubt definition at some point may become so incomprehensible that it is prejudicial, the government argues that this is not the ease here. In support of its argument, the government cites to a number of eases wherein this court has ruled that although the reasonable doubt instruction given was objectionable, no reversal was warranted. The government argues the instruction given in this instance does not rise to the level of those objectionable reasonable doubt instructions and, therefore, that no reversal is required here.
We have had numerous occasions to consider the propriety of instructing on a definition of reasonable doubt. In Lawson, supra, we held that the refusal to instruct on reasonable doubt even where an acceptable instruction has been offered, is not reversible error. In so ruling, this court reasoned that defining reasonable doubt is often more confusing than illuminating. 507 F.2d at 443. In United States v. Marquardt, 786 F.2d 771, 785 (7th Cir.1986), in which we affirmed our decision in Lawson, we held that a failure to define reasonable doubt is not prejudicial. However, our rulings in Lawson and Marquardt left open the question whether it is a reversible error to give a jury any definition of reasonable doubt, the very issue presented here.
Although we have decried the use of instructions which attempt to define reasonable doubt, Martin-Trigona, 684 F.2d at 493; United States v. Allen, 596 F.2d 227, 230 (7th Cir.), cert. denied, 444 U.S. 871, 100 S.Ct. 149, 62 L.Ed.2d 97 (1979), we have also held that defining reasonable doubt will constitute reversible error only where the instruction is misleading or confusing. United States v. Regilio, 669 F.2d 1169, 1178 (7th Cir.), cert. denied, 457 U.S. 1133, 102 S.Ct. 2959, 73 L.Ed.2d 1350 (1982). Thus, although defining reasonable doubt has not constituted a per se reversible error, we have held that any confusion engendered by such a definition may indeed create error.
The instruction given in this case does equate “reasonable doubt” with “fair doubt” and defines a fair doubt as one “based on reason and common sense.” Was that language confusing, thereby im-permissibly diminishing the government’s burden of proof? In United States v. Wright, 542 F.2d 975 (7th Cir.1976), cert. denied, 429 U.S. 1073, 97 S.Ct. 810, 50 L.Ed.2d 790 (1977); United States v. Hollinger, 553 F.2d 535 (7th Cir.1977), this court reviewed a number of similar instructions which equated a reasonable doubt to a substantial doubt. The Wright court first took note of two cases, including United States v. Gratton, 525 F.2d 1161 (7th Cir.1975), stay denied, 423 U.S. 1067, 96 S.Ct. 1090, 46 L.Ed.2d 658 (1976) in which the court held that in the absence of an objection to an instruction defining rea[1039]*1039sonable doubt as a substantial doubt, no reversible error was committed, and United States v. Crouch, 528 F.2d 625 (7th Cir.), cert. denied, 429 U.S. 900, 97 S.Ct. 266, 50 L.Ed.2d 184 (1976), in which the court said that had the instructing judge been aware of the Gratton decision, the instruction given, equating reasonable doubt with substantial doubt, would have constituted reversible error. After reviewing Gratton and Crouch, the Wright court then issued the following admonition, “a district court giving a reasonable doubt instruction containing the challenged equation [reasonable doubt = substantial doubt] ... can reasonably expect a reversal.” 542 F.2d at 988.
The issue we must decide in this case is whether equating a reasonable doubt to a fair doubt is akin to equating a reasonable doubt to a substantial doubt. It is not. Fair doubt, in the context of this instruction, is neutral indicating an application of fairness. However, substantial doubt is quantitative and is in derogation of reasonable doubt. The phrase “fair doubt” is unhelpful, but it does not impinge upon the reasonable doubt standard.
Other factors also influenced our decisions in cases in which a definition of reasonable doubt was attempted. Despite dubious language, equating reasonable doubt to some other measure of doubt, the instructions did not constitute a constitutional infringement where the instructions also contained language that a defendant is presumed innocent; that the burden of proof never shifts from the government; that the defendant is not obligated to come forward with any evidence; and that a failure to prove guilt beyond a reasonable doubt must result in an acquittal. United States v. Crouch, supra, United States v. Shaffner, 524 F.2d 1021 (7th Cir.1975), cert. denied, 424 U.S. 920, 96 S.Ct. 1126, 47 L.Ed. 2d 327 (1976).
In this case, the instruction given to the jury stated that a defendant is entitled to a presumption of innocence which, if the government fails to meet its proof, is sufficient to acquit the defendant. Additionally, the instruction also stated that the burden of proving the defendant’s guilt beyond a reasonable doubt, as to each essential element of the crime, was on the government. The instruction stated further that the defendant may rely on the government’s failure to meet its burden, implying the defendant was not obligated to come forward with any evidence of his own. We believe that in light of the language of the entire instruction, equating reasonable doubt to fair doubt did not constitute reversible error in this case.
The tortured attempts to define reasonable doubt have yet to produce anything which has been approved by this court. Moreover, we have recently indicated that no attempt should be made to define reasonable doubt. United States v. Glass, 846 F.2d 386, 387 (7th Cir.1988).3 The reason for the prohibition is not that all attempted definitions of reasonable doubt infringe upon the constitutional rights of a defendant. Some, as we have found here, do not. However, the point is that, at best, definitions of reasonable doubt are unhelpful to a jury, and, at worst, they have the potential to impair a defendant’s constitutional right to have the government prove each element beyond a reasonable doubt. An attempt to define reasonable doubt presents a risk without any real benefit.
2. Presumption of Truthfulness Instruction
Defendants next argue that the trial court committed error when, over objection, it instructed the jury that trial witnesses are assumed to speak the truth.4 [1040]*1040Defendants rely on the case United States v. Varner, 748 F.2d 925 (4th Cir.1984) in which the Fourth Circuit Court of Appeals ruled that “an instruction that a witness is presumed or assumed to tell the truth is improper.”
Magnant, in particular, objects to this instruction. Hall testified on her own behalf but Magnant chose to forego an opportunity to take the stand. Magnant argues that this instruction was especially prejudicial to him since it implies that because he did not take the stand, it cannot be assumed that he was truthful.
The government again acknowledges that this court has disapproved of general witness credibility instructions, but argues that we have never reversed a conviction because of such an instruction. The government points out that even in circuits in which a presumption of truthfulness instruction has led to a reversal, the courts look to the complete jury charge before reversing. Only if the entire jury charge is tainted by the truthfulness instruction will a conviction be reversed.
In 1967 and 1969, in cases in which the same district judge who presided in this case, also presided,5 we cast doubt on the value of an instruction which advises the jury of a presumption or assumption that a witness speaks the truth. However, contrary to other circuits, it does not appear that we specifically and unequivocally advised district judges to discontinue any reference to a presumption or assumption of a witness’ truthfulness. See United States v. Hyman, 741 F.2d 906, 909-10 (7th Cir.1984); United States v. Quinn, 398 F.2d 298 (7th Cir.), cert. denied, 393 U.S. 983, 89 S.Ct. 451, 21 L.Ed.2d 444 (1968).
In United States v. Isaacs, 493 F.2d 1124, 1163 (7th Cir.1974), we ruled that an instruction which states that a witness is “sworn” to tell the truth does not create the same constitutional concerns as one that instructs that a witness is “assumed” or “presumed” to tell the truth. In this case, the court instructed the jury the “we start out assuming that the witness will speak the truth.” While the instruction contains the language which has been specifically disapproved, we have never reversed a conviction on the basis of such an instruction. Hyman, 741 at 909 n. 4 (7th Cir.1984), and we will not do so in this case.
We indeed have found it “a better practice to refrain from giving [a presumption of truthfulness] instruction.” United States v. Roviaro, 379 F.2d 911, 915 (7th Cir.1967). Later the same year, we said, “It would be better not to use this language.” United States v. Dichiarinte, 385 F.2d 333, 339 (7th Cir.1967), cert. denied sub nom., Mastro v. United States, 390 U.S. 945, 88 S.Ct. 1029, 19 L.Ed.2d 1133 (1968). Although the "helpfulness” of the presumption of truth instruction has been debated, it has been held not to be unfair to the defendant. United States v. Knaack, 409 F.2d 418 (7th Cir.1969), cert. denied, 396 U.S. 831, 90 S.Ct. 87, 24 L.Ed.2d 83 (1969). Finally, we have also found such an instruction to be no error at all when the defendant who challenged it took the witness stand. Quinn, 398 F.2d at 303.
In fact, the presumption is correct —a witness is presumed to tell the truth once he is sworn. However, it is the focus on this presumption in a criminal case [1041]*1041which has been thought to “water down” the more important presumption of innocence of a non-testifying defendant. The safest course is, therefore, to refrain from the possibility of a negative inference regarding a criminal defendant’s decision not to testify. The danger of such a negative inference may be slight, but it is there.
Thus, in evaluating the impact of the instruction in this case, we must look at the totality of the circumstances. In the context of the instructions as a whole, we find that the single phrase on the general assumption of a witness’ truthfulness did not conflict with defendants’ presumption of innocence or with the government’s burden of proof, and did not invade the jury’s ability to judge the witnesses’ credibility. See Cupp v. Napghten, 414 U.S. 141, 94 S.Ct. 396, 38 L.Ed.2d 368 (1973).6
3. “In Camera” Affidavit
Hall next argues that the government impermissibly obtained an affidavit that she allegedly had submitted to the district judge for an in camera review. Because the government was able to obtain this affidavit, which contained certain matters that she would not have revealed to the government, Hall contends the government was able to cross-examine her more effectively at trial.
Shortly before the trial commenced, defendant Hall filed a motion for severance. In support of her motion for severance, Hall submitted a multi-page affidavit, labeled “in camera,” in which she argued that her co-defendant Larry Bradi was hostile and antagonistic toward her. Hall did not, however, request an in camera review of the affidavit. Moreover, she bypassed normal filing procedures by simply labeling the affidavit “in camera ” and mailing it to the judge’s chambers. Reference to the purported in camera submission was set forth in her written motion, and she notified the government by letter that an affidavit had been submitted. The judge, upon receipt of the affidavit, had his clerk file it as a part of the court record. As a result, the government, in responding to Hall’s severance motion and in searching through the court record, discovered Hall’s affidavit.
Hall now argues that it was incumbent upon the government to alert the trial court and/or defense counsel that it was in possession of the affidavit. In addition, regardless of the fact that the affidavit was found in the court record, Hall argues that the government should not have used the affidavit to cross-examine her. Defense counsel expressed some dismay that, at the time of the trial, the judge neither realized that the affidavit had been “submitted in camera,” nor knew that the affidavit had been filed in support of the motion for severance. Apparently, the court denied Hall’s motion for severance without a hearing before trial. Hall now argues that her conviction must be reversed since the acquisition of the affidavit violated her sixth amendment right to effective assistance of counsel. Hall also argues that the government’s failure to disclose the fact that they had obtained her affidavit violated Fed.R.Crim.P. 16,
The government contends that Hall’s position with regard to the affidavit is untenable. When the government sought to introduce the affidavit at trial to impeach Hall, defense counsel objected to its use. The prosecution explained that it had obtained the affidavit from the public record. The court, at that time, indicated that it did not recall receiving the affidavit under seal and that in any event it would not have accepted such an affidavit for in camera review since there was no reason for submission of such a secret document. Ultimately, the court barred the government from using the affidavit to impeach Hall. The government argues that Hall’s contention that the affidavit was impermissibly obtained and used is, therefore, moot.
[1042]*1042We agree. When the government attempted to use the affidavit to impeach Hall, defense counsel objected. The court sustained the objection and disallowed its use. No other objections were made. Thus, having won her only objection to the use of the affidavit at trial, defendant Hall did not preserve any other issue for appeal.
As an additional matter, Hall’s affidavit contained no new evidence of which the government was not already aware. Hall provided the government with the information contained in the affidavit in her previous motion for a bill of particulars. In that motion, Hall indicated that her defenses would include involuntary drug addiction, threatened harm, and a withdrawal from the conspiracy. Nothing in the affidavit could therefore be described as new evidence.
Hall’s designation of an affidavit as “in camera ” did not render that affidavit judicially sealed or trigger an in camera review by the district judge. An in camera review requires much more. The properly limited use of in camera review typically occurs during the course of litigation and requires adversarial safeguards. Initially, a party seeking an in camera review of any material must give appropriate notice of such a request to the opposing party as well as the court. Once the purpose for the in camera review is explained, the opposing party has an opportunity to respond, and the court may then either accept or reject the review proposal. If the court agrees to an in camera review, the moving party submits the material to the judge with such submission noted on the docket. The judge makes his in camera review. Then, depending on the judge’s findings and the terms of submission outlined by him, the material may be ordered sealed. Whether sealed or unsealed, the material is preserved as a part of the court record. Of course, variations of this method may be provided by the district judge.
In light of the inappropriate procedure used by Hall in submitting an essentially ex parte communication to the court, it is not surprising that the affidavit ended up a matter of public record in the clerk’s office —thus, making it available for government examination.
4. Ability to Impeach Witness
As a final matter, Hall argues that the trial court impermissibly restricted her ability to impeach the credibility of a non-testifying co-conspirator. At trial, a Chicago police officer testified that he had several conversations with codefendant Caskey. These conversations were secretly taped. During one of the conversations, Caskey told the police officer that Larry Bradi and Hall had transported cocaine from Los Angeles to Chicago. Hall attempted to attack Caskey’s credibility by asking the testifying police officer whether he believed Caskey. The judge would not permit this line of questioning. On appeal, Hall contends that the court’s refusal to permit her to cross-examine the police officer was equivalent to a refusal to permit impeachment testimony on Caskey’s prior convictions.
The district court correctly declined to permit the cross-examination regarding the officer’s opinion of Caskey. Hall did not attempt to use Caskey’s prior convictions for impeachment purposes. The record shows that Hall never indicated that she wished to attack the credibility of Caskey (the non-testifying co-conspirator) with evidence of Caskey’s prior convictions. The record shows only that Hall’s counsel wanted to question the testifying police officer about whether he believed Caskey, clearly an impermissible means of impeachment. Schultz v. Thomas, 832 F.2d 108, 110 (7th Cir.1987). Moreover, although the court invited counsel to make a proffer of the impeachment evidence outside of the jury’s presence, counsel did not take advantage of that opportunity. Thus, Hall waived any argument that evidence of Caskey’s prior convictions should have been admitted. We find the district court correctly declined to admit the proffered evidence.
We note that even if Hall had proffered evidence of the co-conspirator’s prior convictions, there is some question whether that evidence would have been admissible. In United States v. Robinson, 788 F.2d 64 (7th Cir.1986), this court recognized that [1043]*1043problems arise when the co-conspirator/de-clarant, whose credibility is subject to attack by evidence of prior crimes, is also a co-defendant. Where one defendant attempts to attack the credibility of another by introducing evidence of the co-defendant’s prior convictions, there is a danger that the co-defendant’s defense will be prejudiced since the presumption of innocence accorded the co-defendant may become tainted. Fed.R.Evid. 404(b); Robinson; 783 F.2d at 67.
As in Robinson, the statements of the non-testifying co-conspirator in this case were also the statements of a co-defendant. Thus, had Hall proffered evidence of the declarant’s prior convictions, there is some doubt whether those convictions would have been admissible.
In conclusion, we find no reversible error occurred and the convictions of appellants Hall and Magnant are Affirmed.