Does a prosecutor who vouch for documentary evidence and a government witness deny a fair trial to a defendant?

MultiRegion, United States of America

The following excerpt is from U.S. v. Matta-Lopez, 73 F.3d 371 (9th Cir. 1995):

Matta contends for the first time on appeal that the prosecutor denied him a fair trial by vouching for documentary evidence and a government witness. The prosecutor's statements were not plain error. See United States v. Laurins, 857 F.2d 529, 539 (9th Cir.1988), cert. denied, 492 U.S. 906 (1989).

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