Cornell University law professor Sherry F. Colb comments on a recent decision in which the U.S. Supreme Court held that a juror’s use of racial stereotypes to vote for conviction may be used to invalidate the verdict, despite evidentiary rules that otherwise prohibit the use of juror testimony to challenge a verdict. Colb argues that the Supreme Court should have either extended the Sixth Amendment exception to cover other types of juror misconduct, or repealed the rule that prohibits the use of post-verdict juror testimony to impeach a verdict.