The following excerpt is from U.S. v. Callum, 107 F.3d 878 (9th Cir. 1997):
A district court's decision to admit lay opinion testimony under Federal Rule of Evidence 701 1 "must be upheld unless shown to be clearly erroneous or a clear result of an abuse of judicial discretion." United States v. Skeet, 665 F.2d 983, 985-86 (9th Cir.1982).
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