discussed Cited "see" Securities & Exchange Commission v. Ficken See United States v. Bollin, 264 F.3d 391, 413 (4th Cir.2001), cert. denied, 534 U.S. 935 , 122 S.Ct. 303 , 151 L.Ed.2d 225 (2001), and cert. denied, 535 U.S. 989 , 122 S.Ct. 1544 , 152 L.Ed.2d 469 (2002); United States v. Peterson, 100 F.3d 7, 13-14 (2d Cir.1996) (noting that “when a defendant invokes his Fifth Amendment privilege, he has made himself unavailable to any other party, but he is not unavailable to himself” and thus that it was within the district court’s discretion to exclude the defendant's prior grand jury testimony when the defendant asserted the privilege at trial); Un…