*163 OPINION

A jury convicted Brian Stephen Johnson of possession with intent to distribute cocaine, in violation of 21 U.S.C.A. § 841 (West 1999 & Supp. 2001). He appeals his conviction, challenging the district court’s refusal to dismiss a juror for cause, exclusion of expert testimony, and decision to permit the jury to take transcripts of recorded conversations into the jury room during deliberations. Finding no reversible error, we affirm.

Johnson argues that the district court violated his Sixth Amendment right to an impartial jury when the court refused to strike Juror 538 for cause, forcing him to use a peremptory challenge to remove Juror 533 from the jury. Assuming, as Johnson suggests, that the district court’s denial of his motion to strike Juror 533 for cause was erroneous, we find that such error does not warrant reversal. See United States v. Martinez-Salazar, 528 U.S. 304, 317, 120 S.Ct. 774, 145 L.Ed.2d 792 (2000) (holding that “a defendant’s exercise of peremptory challenges ... is not denied or impaired when the defendant chooses to use a peremptory challenge to remove a juror who should have been excused for cause”).

Next, Johnson contends that the district court should not have excluded testimony from an expert in narcotics investigations, which he claims was necessary to rebut the confidential informant’s understanding of the tape-recorded conversations with Johnson, to explain investigative techniques, and to show how the Government mishandled its informant. Because Johnson extensively cross-examined the Government’s witnesses on these issues and testified as to his understanding of the conversations with the Government informant, we agree with the district court that such testimony would not assist the trier of fact. Thus, we find no abuse of discretion in the district court’s exclusion of this testimony. See United States v. Barsanti, 943 F.2d 428, 432 (4th Cir. 1991) (stating standard of review); Fed.R.Evid. 702.

Finally, Johnson asserts that the district court erred in allowing the jury to take the transcripts of the tape-recorded conversations between him and the confidential informant into the jury room during deliberations. We review for an abuse of discretion a district court’s decision to allow transcripts, along with the actual taped evidence, to be taken into the jury room during deliberations. See United States v. Ademaj, 170 F.3d 58, 65-66 (1st Cir. 1999) (stating standard of review). Johnson did not challenge the accuracy of the transcripts, and the district court gave cautionary instructions that the tapes — not the transcripts — were evidence. We therefore find that the district court did not abuse its discretion by allowing the jury to have the transcripts during deliberations.

Accordingly, we affirm Johnson’s conviction. We dispense with oral argument because the facts and legal contentions are adequately presented in the materials before the court and argument would not aid the decisional process.

AFFIRMED.