[2] Gregory Warger and Randy Shauers were involved in a traffic accident in Rapid City, South Dakota.

[2] Warger then asked for a new trial based on the juror's statement, stating that he fulfilled the requirements of McDonough Power Equipment, Inc. v. Greenwood (1984).

[1][2] Justice Sonia Sotomayor delivered the unanimous judgment of the Court, affirming the lower court's ruling that Federal Rule of Evidence 606(b) "applies to any proceeding in which the jury's verdict might be invalidated, including efforts to demonstrate that a juror lied".

[2] She cited Tanner v. United States (1987), which ruled that juror testimony to impeach a jury verdict were inadmissible.

"[2] Furthermore, Sotomayor argued that the jury's forewoman's experiences with her daughter's accident did not qualify as "extraneous prejudicial information", an exception to Rule 606(b): "[Her] daughter's accident may well have informed her general views about negligence liability for car crashes, but it did not provide either her or the rest of the jury with any specific knowledge regarding Shauers' collision with Warger".