California, United States of America
The following excerpt is from People v. Randall, C054685 (Cal. App. 10/30/2008), C054685 (Cal. App. 2008):
"It is improper for a prosecutor to offer assurances that a witness is credible or to suggest that evidence available to the government but not before the jury corroborates the testimony of a witness." (People v. Cook (2006) 39 Cal.4th 566, 593.)
"However, so long as a prosecutor's assurances regarding the apparent honesty or reliability of prosecution witnesses are based on the `facts of [the] record and the inferences reasonably drawn therefrom, rather than any purported personal knowledge or belief,' [the] comments cannot be characterized as improper vouching.'" (People v. Frye (1998) 18 Cal.4th 894, 971.)
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