Opinion by Judge WIGGINS; Partial Dissent by Judge HALL.

OPINION

Dennis Keith McChristian and John Berry Ingram were convicted of conspiracy to possess with intent to distribute methamphetamine, possession with intent to distribute that drug, and aiding and abetting. They appeal from several of the district court’s trial and sentencing rulings. 1

*1502 DISCUSSION

A. Prior Conviction

Ingram was convicted in 1982 in state court. The district court, relying on this prior conviction, sentenced Ingram to life without parole pursuant to 21 U.S.C. § 841 (b). Ingram attempted to challenge the constitutionality of the 1982 conviction on the ground that his guilty plea was not knowing and voluntary. Ingram also tried to show that, after he had been indicted in federal court on the current charge, a state trial court had held the 1982 conviction invalid. The district court rejected Ingram’s arguments, relying on 21 U.S.C. § 851 (e), which provides that the validity of a prior conviction that “occurred more than five years before the date of the information alleging such prior conviction” cannot be challenged.

Ingram argues that 21 U.S.C. § 851 (e) is unconstitutional. This argument must fail, however, in light of recent Supreme Court and Ninth Circuit precedent. Although this circuit originally held 21 U.S.C. § 851 (e) unconstitutional, in United States v. Davis, 15 F.3d 902 (9th Cir.1994), that opinion was subsequently withdrawn and reversed in light of a new Supreme Court case, Custis v. United States, — U.S.-, 114 S.Ct. 1732 , 128 L.Ed.2d 517 (1994).

The Court in Custis ruled that a defendant does not have a constitutional right to challenge a prior conviction which is otherwise proscribed by the Armed Career Criminal Act, 18 U.S.C. § 924 (e)(1) (ACCA). The Court held that, except in the limited circumstance in which the prior conviction was obtained in violation of the right to have counsel appointed, see Gideon v. Wainwright, 372 U.S. 335 , 83 S.Ct. 792 , 9 L.Ed.2d 799 (1963), a defendant has no constitutional right to challenge prior convictions used to enhance a currently imposed sentence. — U.S. at -, -, 114 S.Ct. at 1737-39 . Because Custis’s arguments against his prior convictions did not include allegations that he was without counsel and that none was appointed for him, Custis was not allowed to attack the prior convictions. Id. at-, 114 S.Ct. at 1738 .

This circuit, following Custis , recently withdrew its original Davis decision, and ruled that § 851(e)’s provisions are constitutional. United States v. Davis, 36 F.3d 1424, 1438-39 (9th Cir.1994). Therefore, because Ingram does not allege that his 1982 conviction is invalid for lack of having counsel appointed for him, he has no constitutional right to attack the 1982 conviction.

Ingram presents another argument that the district court erred in relying on the 1982 conviction, however. After Ingram was indicted in federal court and became aware that the government would attempt to rely on the 1982 conviction, Ingram went back to Kern County Superior Court, the court that convicted him in 1982, and moved that his case be reopened and his conviction be stricken. The Kern County Superior Court, Judge Rebecca A. Wiseman, reopened Ingram’s ease on July 7, 1992, and granted Ingram’s motion to strike the prior conviction. Thus, at the time Ingram was sentenced in federal court in October 1992, the 1982 conviction had been declared invalid by the court of conviction. Ingram contends that the district court erred in relying on this invalid conviction and that § 851(e) does not preclude Ingram from showing the court that the conviction has been invalidated. We agree.

At issue is whether the phrase “challenge the validity” in § 851(e) includes a showing that a prior conviction has been invalidated in a proceeding in state court. Ordinarily, Ingram could make such a showing under § 851(e)(1) which allows defendants to “elaim[ ] that any conviction alleged is invalid.” However, if § 851(e), which bars any “challenge [to] the validity” of a five-year-old conviction, precludes such a showing, then the district court did not err. On the other hand, if “challenge the validity” does not include a simple showing that a prior convic *1503 tion has been invalidated in a state court proceeding, then the district court erred in failing to accept Ingram’s showing, and Ingram’s sentence should be vacated.

Though we have found no ease law on point on this question, we are persuaded by several reasons that “challenge the validity” does not include the type of showing Ingram attempted. First, after Ingram’s conviction was invalidated by the Kern County Superior Court, Ingram’s 1982 conviction had no “validity” that could be challenged. The court that convicted Ingram struck the conviction. Thus, any challenge in federal court to the validity of that conviction would have been moot.

Second, a careful reading of the statute convinces us that § 851(e)’s purpose was to exclude from federal court only collateral challenges to convictions and not reports of successful collateral challenges completed in state court. Section 851(e) prevents only a “challenge [to] the validity of [the] prior conviction.” The word “challenge” is used only three other times in § 851, once in § 851(b) and twice in § 851(c)(2). Section 851(b) is ambiguous as to whether “challenge” includes the submission of evidence that a pri- or conviction has been invalidated by a state court. Section 851(c)(2) is not ambiguous, however. Section 851(c)(2) outlines what steps a defendant must take to mount in federal court a full-blown, eoEateral attack on a prior conviction. The section sets forth the burden of proof necessary and imposes time limits within which such an attack must be made. “Challenge” in § 851(c)(2) clearly refers to a collateral attack in federal court. Because “challenge” to a prior conviction, as used in § 851(c)(2), means only a full-blown, collateral attack in federal court on the prior conviction, we conclude that “challenge” means the same in § 851(e). See King v. St. Vincent’s Hospital, 502 U.S. 215, 221 , 112 S.Ct. 570, 574 , 116 L.Ed.2d 578 (1991) (“[A] statute is to be read as a whole ... since the meaning of statutory language ... depends on context.”).

Third, our interpretation of the statute is fair to the government. The government has various interests that § 851(e) serves by excluding collateral challenges to old eonvie-tions (expense of keeping court records indefinitely, concerns about evidence being lost over time, and “thorny procedural difficulties” at sentencing hearings, Davis, 36 F.3d at 1438 ). In Ingram’s case, however, in which a prior conviction was held invalid by a state court before Ingram’s sentence was imposed, these interests in the finality of sentences are inapposite. We can think of no government interest in enhancing a defendant’s sentence based on a prior conviction that has already been shown to be obtained in violation of the Constitution. For these reasons, we think § 851(e) would not preclude Ingram showing, hypothetically, that the 1982 conviction was invalidated in a 1988 habeas proceeding. The 1992 collateral proceeding in state court was substantively no different than a 1988 habeas proceeding. The mere fact that the invalidation occurred shortly after Ingram was indicted in federal court, rather than shortly before, makes no difference. For the foregoing reasons, we conclude that Ingram may “claim that [his 1982] conviction [was] invalid,” as § 851(c)(1) allows, even though § 851(e) precludes a “challenge [to] the validity of’ that conviction under § 851(c)(2). Section 851(e) does not preclude Ingram from claiming that his 1982 conviction was invalid, even though Ingram may not mount in federal court a collateral attack on that conviction. The district court therefore erred in relying on § 851(e).

Ingram’s successful collateral attack on his 1982 conviction was on appeal at the time Ingram was sentenced. Along with § 851(e), the district court cited this fact in relying on the 1982 conviction. We conclude that this reliance was also error. Williams v. United States, 651 F.2d 648 (9th Cir.1981), which held that a prior conviction is not “final” for enhancement purposes while certiorari before the Supreme Court is pending, indicates that no reliance should be placed on a conviction while direct appeal is pending. Considerations that guided Williams guide our decision. Both the “orderly administration of justice” and the “possib[ility of] conflicting results [between state and federal court decisions], with all their attendant complications and embarrassments,” 651 F.2d at 650 (internal quotations omitted), suggest *1504 that the district court should refrain from relying on a conviction that has been held invalid by a state court, while the appeal of that invalidation is pending. We therefore conclude that the district court erred in precluding Ingram from showing that his 1982 conviction had been invalidated.

B. Indictment

The superseding indictment in this case was returned before a federal magistrate judge, as the record reflects:

Ingram claims that the indictment was not returned “publicly” and that this defect is fatal to the indictment and violates the Fifth (grand jury) and Sixth (public trial) Amendments. In support, Ingram cites Renigar v. United States, 172 F. 646, 650 (4th Cir.1909) (“[I]t is essential to the validity of an indictment that it be presented in open court and in the presence of the grand jury.”); Fed. R.Crim.P. 6(f) (“The indictment shall be returned by the grand jury to a federal magistrate judge in open court.”); and Fed. R.Crim.P. 31(a) (requiring that verdicts also be “returned by the jury to the judge in open court”). Ingram also contends that the failure to return the indictment in open court is jurisdictional. Renigar, 172 F. at 658 (holding such defect to be jurisdictional).

We must reject Ingram’s arguments. United States v. Lennick, 18 F.3d 814 (9th Cir.), cert. denied, — U.S.-, 115 S.Ct. 162 , 130 L.Ed.2d 100 (1994), controls this issue. In Lennick , the indictment was “not physically handed to a federal magistrate in open court[, but] ... the prosecuting attorney handed it to a court clerk when the court was not in session.” Id. at 817 . The court reasoned:

Id. (internal quotations and citations omitted). In Lennick , the grand jury foreman and U.S. Attorney signed the indictment and the clerk filed it promptly. Lennick was arraigned five days later and made no objection. The trial was held promptly. The indictment notified Lennick of the charges against him. He failed to show that the grand jury treated him unfairly. Further, evidence against Lennick was overwhelming. A jury later found him guilty. Nothing suggested that the grand jury would not have returned the indictment in open court. For all of these reasons, the court held that the procedure employed in Lennick was not fundamentally unfair and was therefore harmless, even though it technically violated Rule 6(f). Id. at 817-18 .

Ingram alleges that his indictment was defective because the public was not present when the magistrate received it and the grand jury did not return the indictment as a body. These alleged defects were present in Lennick . Further, the grand jury foreman and U.S. attorney were present when the magistrate received and opened Ingram’s indictment. Ingram has not alleged that his arraignment or trial was delayed, that the grand jury treated him unfairly, or that the indictment did not fairly notify him of the charges. Ingram later admitted factual guilt before the petit jury, which convicted him. Nothing suggests that the grand jury would not have returned the indictment in open court or that Ingram was harmed as a result of their failure to do so. In these circum *1505 stances, a harmless error standard applies, 2 and Lennick controls. The error was harmless.

C. Arrest of Defense Witness

Ingram alleges that the prosecutor engaged in misconduct by ordering a defense witness, Billie Allison, arrested and then informing the jury of the arrest. When Ms. Allison arrived at the courthouse to testify, she was under the influence of methamphetamine. Later in the trial, the prosecutor called a police officer to the stand and examined him at length about his coming to the U.S. Attorney’s office after Ms. Allison testified to examine Ms. Allison and allegations that she was under the influence of drugs. We find the prosecutor’s conduct to be appropriate. Ms. Allison testified under the influence. The prosecutor had a right, and maybe a duty, to point that out. Moreover, Ingram’s contention that the jury was informed that Ms. Allison was arrested is not supported by the record.

D. Testimony Regarding Addiction

At trial, McChristian offered the testimony of a Dr. Terrell that McChristian was a drug addict. Terrell’s opinion was based on his interview with McChristian and investigative reports submitted to Terrell by defense counsel. Terrell also examined a videotape of the “reverse sting” police used to snare MeChris-tian and Ingram. Terrell did not have MeChristian’s past medical records. On cross, the district court allowed the prosecutor to elicit a statement from Terrell that drug addicts may participate in drug conspiracies but are generally relegated to minor roles such as sampling or carrying drugs.

McChristian argues that this last testimony was improper. In support, McChristian cites to numerous eases holding that evidence that a particular defendant fits a drug courier profile is inadmissible to show the defendant’s guilt or innocence, e.g., United States v. Lui, 941 F.2d 844, 847 (9th Cir.1991). McChristian also argues that Terrell’s testimony fits within none of the exceptions to “no-profile” rule. E.g., United States v. Gomez-Norena, 908 F.2d 497, 501 (9th Cir.) (background material exception), cert. denied, 498 U.S. 947 , 111 S.Ct. 363 , 112 L.Ed.2d 326 (1990); United States v. White, 890 F.2d 1012, 1014 (8th Cir.1989) (modus operandi exception), cert. denied, 497 U.S. 1010 , 110 S.Ct. 3254 , 111 L.Ed.2d 763 (1990); United States v. Beltran-Rios, 878 F.2d 1208, 1212 (9th Cir.1989) (allowing drug courier profile evidence in rebuttal). McChristian contends Terrell in effect testified that, because McChristian fit the “profile” of an addict in a drug conspiracy, he was part of the conspiracy.

We reject McChristian’s arguments. Evidentiary rulings are reviewed for abuse of discretion. United States v. Catabran, 836 F.2d 453, 456 (9th Cir.1988). Terrell did not mention drug courier profiles. No evidence shows he was qualified to testify as to drug courier profiles. Nor was Terrell asked whether drug addiction is a characteristic of a drug courier. Instead, he was asked the inverse: whether a drug addict could carry drugs or otherwise function in a drug conspiracy. Thus, the cited “no-profile” cases are inapposite.

Moreover, the prosecutor’s question was not intended to show MeChristian’s guilt or innocence; rather, it was intended to preclude any argument by McChristian that he was innocent because he was a drug addict. McChristian admits that his “entire defense was based ... on the argument ... that he was [present at the drug transaction] as a dependent drug addict hoping for some scraps of drugs to fall from the conspirator’s drug table and not ... as a participant to or in the negotiation for purchase of drugs.” Terrell was brought to testify in support of this defense. The prosecutor’s question aimed to elicit testimony that McChristian had the capacity to participate in a drug *1506 conspiracy even though an addict. The question was related to Terrell’s testimony on direct and went to the heart of MeChristian’s defense. For these reasons, Terrell’s testimony was admissible.

E. Vouching

On cross-examination of Ms. Farler, a prosecution witness, Mr. Ingram’s counsel elicited testimony from Ms. Farler that the prosecution had threatened to prosecute her for perjury if she did not tell the truth on the stand. On recross, Mr. Elia, MeChristian’s counsel, elicited testimony that Ms. Farler felt intimidated and scared about the notion that she could be prosecuted and that the prosecutor had evidence that would indicate whether she was lying. Mr. Elia stated as follows in closing argument: “Now, ... granted, she didn’t want to testify against Mr. Ingram and it was obvious to me that she had been intimidated and scared to the point where she did come in here.”

In closing argument, the prosecutor responded:

McChristian and Ingram contend that this statement constitutes improper vouching for the testimony of Ms. Farler and other prosecution witnesses. “It is improper for the prosecution to vouch for the credibility of a government witness. Vouching may occur [when] ... the prosecution ... placets] the prestige of the government behind the witness .... ” United States v. Roberts, 618 F.2d 530, 533 (9th Cir.1980). Further, “a prosecutor may not express ... his belief in the credibility of witnesses.... ” United States v. McKoy, 771 F.2d 1207, 1211 (9th Cir.1985). McChristian claims the prosecution vouched for witnesses by referring to the United States and indicating he would live or die by the truth. McChristian claims this error was not harmless, though he does not identify the particular harm done.

We find the prosecutor’s comment to be a fair response to the defense’s closing argument. Neither defendant made any objection to it. Therefore, the propriety of the statement is reviewed for plain error. United States v. Young, 470 U.S. 1, 6, 14-20 , 105 S.Ct. 1038, 1041-42, 1045-49 , 84 L.Ed.2d 1 (1985). Reversal for plain error is reserved for situations in which “a miscarriage of justice would otherwise result.” Id. at 15 , 105 S.Ct. at 1046 (internal quotations omitted). No miscarriage of justice has occurred here. The prosecutor’s reference to the United States was but a minor part of a rebuttal to Mr. Elia’s suggestion that the prosecutor somehow intimidated Ms. Farler into testifying. The prosecutor was merely explaining that the zealous representation of his client required him to inform Ms. Farler that she could be prosecuted for perjury if she did not testify truthfully. The reference to the United States did not throw the “prestige of the government behind the witness.” Roberts, 618 F.2d at 533 . The comment that “we live and we die by the truth in here” is likewise fair. The statement that trial is about getting to the truth is little different from telling the jury that they must decide what the facts are.

Alternatively, these statements were harmless under Young. See 470 U.S. at 4-5, 12-20 , 105 S.Ct. at 1040-41, 1044-49 (allowing remarks quite similar to those at issue here, because they were made in response to defense counsel’s statements that the prosecution had tried to “poison [the jurors’] minds unfairly” through “reprehensible” conduct and that the prosecution did not believe its own case). The prosecutor’s remarks were invited by Mr. Elia’s arguments. Mr. Elia, who cross-examined Ms. Farler at length, stated in his closing argument, “I haven’t tried to mislead you in any way in my cross-examination of the witnesses.... ” Mr. Elia also said, “I’m not trying to pull any fast one over on you.” After these statements, the prosecutor was at least partly justified in *1507 saying that he had not tried to mislead anyone, either. Any error that occurred did not result in a miscarriage of justice.

F. Evidence of Addiction

McChristian did not testify. In closing argument, the prosecutor stated:

McChristian contends that the underlined portions of these statements constituted improper comment on McChristian’s failure to testify.

United States v. Castillo, 866 F.2d 1071, 1083 (9th Cir.1988) (citations and internal quotations omitted).

McChristian argues that, because he is the best witness as to whether he is an addict, a comment on the failure to give evidence of addiction calls the jury’s attention to the fact that McChristian did not testify. See Williams v. Lane, 826 F.2d 654, 665 (7th Cir.1987) (noting that a “no evidence” reference more likely refers to defendant’s failure to testify when it is “highly unlikely that at least a portion of the testimony could have been contradicted by anyone other than the defendant” (internal quotations omitted)). McChristian contends that the reference was not harmless because it went to the heart of his primary defense.

We are not persuaded. Because McChris-tian did not object to the prosecution’s remarks, the district' court’s failure to act against them is reviewed for plain error. See Mitchell v. Goldsmith, 878 F.2d 319, 323-24 (9th Cir.1989). In Castillo , this court refused to find reversible error in the prosecutor’s remark that the defense failed to produce evidence that Castillo resided in a certain apartment. “[W]ouldn’t the defense call the apartment manager?” the prosecutor asked. 866 F.2d at 1083 . This court held that such a comment did not constitute reversible error even though it was objected to at trial.

In United States v. Lopez, 803 F.2d 969 (9th Cir.1986), cert. denied, 481 U.S. 1030 , 107 S.Ct. 1958 , 95 L.Ed.2d 530 (1987), the prosecutor “referred to the lack of any evidence showing that appellants tried to disassociate themselves from” another witness. This court held such reference not to be plain error. 803 F.2d at 973 . In this case, the prosecutor’s comments were made to call attention to the lack of medical records or other credible evidence beyond McChristian’s self-serving statements to Terrell. The prosecutor had cross-examined Terrell on that basis. The prosecutor’s comments in this case are most like those in Castillo and Lopez . Thus, no plain error is shown.

G. Other of the Prosecutor’s Closing Arguments

Both Ingram and McChristian claim that the prosecutor made numerous other unfair closing arguments. They contend that all of these arguments were unfair attacks on defense counsel and were intended to inflame the jury.

“[I]n fashioning closing arguments, prosecutors are allowed reasonably wide latitude and are free to argue reasonable inferences from the evidence.” United States v. Enriquez-Estrada, 999 F.2d 1355, 1361 (9th Cir.1993) (citations and internal quotations omitted). “Ordinarily[,] cautionary instructions” *1508 or other “prompt and effective action[s] by the trial court” are “sufficient to cure the effects of improper comments.” Id. (internal quotations omitted). Juries “are presumed to follow such cautionary instructions.” Id. In this case, the district court instructed the jury thoroughly that comments of counsel during closing arguments are not evidence and that the jury was to decide the facts. 3

“[Pjrosecutorial misconduct invites reversal if it appears more probable than not that the alleged misconduct affected the jury’s verdict.” Id. (internal quotations omitted); United States v. Christophe, 833 F.2d 1296, 1301 (9th Cir.1987) (holding reversal justified only when misconduct “denies the defendant a fair trial” by “materially affect[ing] the verdict”). Nonetheless, “the district judge’s view of the context ... is highly relevant. The district judge is in a much better position to evaluate the prosecutor’s conduct and its impact. This court properly accords considerable deference to the trial court’s view of such matters.” United States v. Sanchez-Robles, 927 F.2d 1070, 1077 (9th Cir.1991) (internal quotations omitted). Moreover, that a prosecutor’s remarks were made in response to defense counsel’s arguments, as an “invited reply,” may justify the remarks. Young, 470 U.S. at 14-20 , 105 S.Ct. at 1045-49 ; United States v. Tham, 665 F.2d 855, 861-62 (9th Cir.1981), cert. denied, 456 U.S. 944 , 102 S.Ct. 2010 , 72 L.Ed.2d 466 (1982).

Further, the presence of a factually strong case against a defendant runs contrary to the notion that improper remarks by the prosecutor materially affected the verdict. See Hall v. Whitley, 935 F.2d 164, 165-66 (9th Cir.1991). This factor is important in this case, in which evidence of the defendants’ guilt is strong. Ingram admitted to the jury that he paid $20,000 for the methamphetamine and that he had a scale so that he could weigh drugs. He admitted that he had been involved in several drug deals before. McChristian was videotaped entering a room and asking Mr. Daggett, the confidential informant, where the “dope” was and trying to set up a smaller deal when the original deal fell through. Both Ingram and McChristian took active roles (and were videotaped) at the final negotiation. Both handled the methamphetamine on videotape and discussed how they planned to take a sample and test it. McChristian carried a sample out of the room.

Appellants have objected to many comments made by the prosecutor. We have examined them separately and cumulatively. We reviewed most of them (the ones unob-jected to at trial), for plain error. Young, 470 U.S. at 14-20 , 105 S.Ct. at 1044-49 . We reviewed the three statements to which the defense did object at trial under the harmless error standard. United States v. Endicott, 803 F.2d 506, 513 (9th Cir.1986). Although we believe both counsel behaved objectionably at trial, we do not find reversible error because: 1) The jury was carefully, thoroughly and repeatedly instructed that counsel’s argument is not evidence; 2) The evidence of guilt was overwhelming; and 3) Defendant’s argument invited most if not all of the objectionable comments.

CONCLUSION

For the foregoing reasons, we AFFIRM in all respects with regard to McChristian. We AFFIRM Ingram’s conviction, but VACATE his sentence and REMAND for resentencing.

. We address only arguments made in Ingram’s first appellant brief and first reply brief, filed by Ingram's counsel. Ingram filed a second appellant brief without permission from this court. See Fed.R.App.P. 28(c) ("No further briefs may be filed except with leave of court.”). This second brief made only arguments not raised in the first. Arguments not raised in the first appellant brief are waived. Sanchez v. City of Santa Ana, 915 F.2d 424, 430 (9th Cir.1990), ce rt. denied, 502 U.S. 815 , 112 S.Ct. 66 , 116 L.Ed.2d 41 and cert. denied, 502 U.S. 815 , 112 S.Ct. 66 , 116 *1502 L.Ed.2d 41 (1991). Moreover, the record does not show that Ingram's counsel has withdrawn or that Ingram is not now represented. Accordingly, we will consider neither Ingram’s second brief nor the government’s response and Ingram’s reply to it that have been lodged with the court.

. Lennick did not specifically address the argument that the rights Ingram asserts are guaranteed by the Fifth and Sixth Amendments. However, Lennick's analysis and its citations to cases that discuss constitutional issues (i.e., Breese v. United States, 226 U.S. 1, 10 , 33 S.Ct. 1, 2-3 , 57 L.Ed. 97 (1912) (indicating that the right to have the indictment presented by the grand jury as a body is not protected by the Fifth Amendment)) persuade us that the rights Ingram asserts are subject to harmless error analysis even if they are protected by the Constitution.

. The district court instructed the jury as follows:

The trial court also stated at other times, "[Wjhat the lawyers say is not evidence.”