Daryl W. Smith appeals his convictions and 360-month sentence for possession with intent to distribute five or more grams of cocaine base, conspiracy to distribute fifty or more grams of cocaine base, and aiding and abetting the distribution of cocaine base within 1000 feet of a playground. Finding no error in Smith convictions, we affirm the convictions. However, because the district court’s imposition of sentence violated Smith’s Sixth Amendment right to trial by jury, we vacate the sentence and remand for further proceedings.
Smith claims that the district court erred by denying his motion for mistrial after one of the jurors made an inappropriate comment during deliberations. The *559decision of whether to grant a motion for a mistrial is left to the broad discretion of the trial court. United States v. Dorlouis, 107 F.3d 248, 257 (4th Cir.1997). Under the circumstances of this case, we see no abuse of discretion. The jury promptly suspended deliberations when the comments were made and referred the matter to the court. The court voir dired each juror individually and determined each was willing to consider all of the evidence fairly and impartially. Finally, the court dismissed the offending juror before allowing the jury to return to deliberations. Under these circumstances we find no error.1
Smith next claims the district court erred by refusing to allow him to impeach a Government witness with a fourteen year old bribery conviction. Relevant prior convictions may be used for impeachment purposes subject to certain limitations. Fed.R.Evid. 609(a). These limitations preclude the use of a conviction more than ten years old except where the probative value of such a conviction substantially outweighs its prejudicial value. Fed.R.Evid. 609(b). This case does not involve the sort of rare and exceptional circumstances that would warrant use of the conviction at issue for impeachment. See United States v. Cavender, 578 F.2d 528, 531 (4th Cir.1978).
Smith also claims he was denied his Sixth Amendment right to confront witnesses by the district court’s ruling that effectively precluded him from impeaching Government witnesses with memoranda of interviews completed by Government agents. Smith asserts the material falls within the scope of the Jencks Act, 18 U.S.C. § 3500 (2000). This court has repeatedly held that such memoranda fall outside the scope of the Jencks Act unless adopted by the witness. See United States v. Roseboro, 87 F.3d 642, 645 (4th Cir.1996); United States v. Hinton, 719 F.2d 711, 722 (4th Cir.1983). Smith concedes no such adoption was made. Furthermore, the court did not err in precluding Smith from providing the witnesses with copies of the memoranda in order that they could adopt or reject the memoranda as their own statements. Accordingly, we find no error.
Finally, Smith claims that the district court’s imposition of sentence violates his Sixth Amendment right to trial by jury. Because we conclude that the district court’s application of the Sentencing Guidelines resulted in an increase to Smith’s Guidelines range on the basis of facts not found by the jury beyond a reasonable doubt, we agree.2 See United States v. Booker,—U.S.-, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005); United States v. Hughes, 401 F.3d 540 (4th Cir.2005). Accordingly, we vacate Smith’s sentence and remand for further proceedings consistent with Booker and Hughes.3 We af*560firm Smith’s convictions. 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 IN PART, VACATED IN PART, AND REMANDED