The following excerpt is from U.S. v. Karr, 742 F.2d 493 (9th Cir. 1984):
Ordinarily the duress defense is submitted to the jury. Id. at 693. If the evidence is insufficient to support the defense as a matter of law, however, the court may exclude evidence of the defense or refuse to instruct on its elements. United States v. Shapiro, 669 F.2d 593, 596 (9th Cir.1982).
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