Does a prosecutor have to vouch for a witness who is not a government witness?

MultiRegion, United States of America

The following excerpt is from United States v. Alcantara-Castillo, 788 F.3d 1186 (9th Cir. 2015):

Our decision in United States v. Weatherspoon, 410 F.3d 1142 (9th Cir.2005), does not compel a contrary result. In that case, the prosecutor extensively vouched for government witnesses. The prosecutor started out by describing a police witness as a credible officer. Id. at 1146. Despite being instructed not to vouch, the prosecutor went on to argue that the police officers

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