California, United States of America
The following excerpt is from People v. Roots, C061656, Super. Ct. No. SF107537A (Cal. App. 2011):
"A prosecutor may make 'assurances regarding the apparent honesty or reliability of' a witness 'based on the "facts of [the] record and the inferences reasonably drawn therefrom."' [Citation.] But a 'prosecutor is prohibited from vouching for the credibility of witnesses or otherwise bolstering the veracity of their testimony by referring to evidence outside the record.' [Citation.]" (People v. Turner (2004) 34 Cal.4th 406, 432-433.)
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