The following excerpt is from U.S. v. Kenney, 911 F.2d 315 (9th Cir. 1990):
There are two things a prosecutor may not do while testifying. The first is vouch for a witness; the second is express a personal opinion on the defendant's guilt or the strength of the case against him. United States v. McKoy, 771 F.2d 1207,
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