In a federal criminal prosecution that requires proof of specific intent, may a court instruct the jury that it may infer willful intent or guilty knowledge from the "irregular manner" in which a defendant's conduct was carried out—an instruction never before approved by any court of appeals and inconsistent with this Court's precedent defining willfulness?

Whether a court may instruct a jury to infer willful intent or guilty knowledge from a defendant's 'irregular manner' in a federal criminal prosecution requiring specific intent