The following excerpt is from Cottrell v. Trimble, 1:04-cv-05943-SMS-HC (E.D. Cal. 2012):
being personally involved with an investigation or transaction that is in evidence, it can be a violation of the rules against vouching or advocates acting as witnesses. See, United States v. Hermanek, 289 F.3d 1076, 1089-99 (2002) (prosecutor's reference to the team investigating the crime as "we" and "us" was considered to be a violation).
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