The following excerpt is from U.S. v. Boyland, 17 F.3d 396 (9th Cir. 1994):
When a district court refuses to give an instruction defining reasonable doubt, the district court has not abused its discretion where the jury has been repeatedly admonished that the government must prove each element of each offense beyond a reasonable doubt and the instructions as a whole in no way lessen the heavy burden intended by the reasonable doubt standard. United States v. Nolasco, 926 F.2d 869, 873 (9th Cir.) (en banc), cert. denied, 112 S.Ct. 111 (1991).
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