The following excerpt is from U.S. v. White, 895 F.2d 1419 (9th Cir. 1990):
Once the defendant has introduced sufficient expert testimony to support a reasonable doubt as to sanity, the government must: (1) introduce its own expert testimony in rebuttal; or (2) discredit the defendant's expert testimony on cross-examination; or (3) rely upon evidence from which the jury may infer that the defendant's expert testimony depends upon an incorrect view of the facts.
United States v. McGraw, 515 F.2d 758, 760
Page 1419
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