The following excerpt is from U.S. v. David, 70 F.3d 1280 (9th Cir. 1995):
In some situations, however, the newly-discovered impeachment evidence may be so powerful that, if it were to be believed by the trier of fact, it could render the witness' testimony totally incredible.
United States v. Davis, 960 F.2d 820, 825 (9th Cir.) (citations omitted), cert. denied, 113 S.Ct. 210 (1992).
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