The following excerpt is from United States v. Williams, 423 F.2d 696 (9th Cir. 1970):
The constitutionality of the presumption of knowledge of importation drawn from the fact of possession of heroin has been settled in Turner v. United States, 396 U.S. 398, 90 S.Ct. 642, 24 L.Ed.2d 610 (1970).
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