discussed Cited "see, e.g." United States v. Jackson See U.S. v. Pitts, 908 F.2d 458, 461 (9th Cir.1990) (quoting, U.S. v. Falu, 776 F.2d 46, 50 (2nd Cir.1985)); see also, U.S. v. Cook, 76 F.3d 596, 602 (4th Cir.) cert. denied, 519 U.S. 939 , 117 S.Ct. 320 , 136 L.Ed.2d 235 (1996) (interpreting 21 U.S.C. § 861 (a)(3) and finding presumption of a knowledge element is not applicable where statute criminalizes conduct that is not otherwise innocent); U.S. v. Chin, 981 F.2d 1275, 1279-81 (D.C.Cir.1992) cert. denied, 508 U.S. 923 , 113 S.Ct. 2377 , 124 L.Ed.2d 281 (1993) (same). 2001WL 1013322, *2.