The following excerpt is from U.S. v. Moreno, 39 F.3d 1189 (9th Cir. 1994):
"As a general rule, a prosecutor may not express ... his belief in the credibility of government witnesses." United States v. Molina, 934 F.2d 1440, 1444 (9th Cir.1991). "Vouching consists of placing the prestige of the government behind a witness through personal assurances of the witness's 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).
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