The following excerpt is from U.S. v. Harris, 65 F.3d 177 (9th Cir. 1995):
"Vouching consists of placing the prestige of the government behind a witness through personal assurances of the witness' veracity, or suggesting that information not presented to the jury supports the witness's testimony." United States v. Necoechea, 986 F.2d 1273, 1276 (9th Cir.1993) (as amended). Vouching presents special problems in cases in which the witness' credibility is crucial. Id. There is
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