s v. United States, 364 U.S. 206, 223 (1960); Rea v. United States, 350 U.S. 214, 216-17 (1956); Hampton v. United States, 425 U.S. 484, 495 (1976) (Powell, J., concurring in judgment)). A court should invoke its supervisory power of suppression when "there has been a fraud upon the court in addition to a

s v. United States, 364 U.S. 206, 223 (1960); Rea v. United States, 350 U.S. 214, 216-17 (1956); Hampton v. United States, 425 U.S. 484, 495 (1976) (Powell, J., concurring in judgment)). A court should invoke its supervisory power of suppression when "there has been a fraud upon the court in addition to a