Can a prosecutor deprive a grand jury of the opportunity to evaluate credibility of witnesses?

MultiRegion, United States of America

The following excerpt is from U.S. v. Al Mudarris, 695 F.2d 1182 (9th Cir. 1983):

A prosecutor may not deprive a grand jury of the opportunity to evaluate the credibility of witnesses. United States v. Samango, supra, 607 F.2d at 884. Appellants contend that the prosecutors here improperly influenced the grand jury and usurped its role by resolving credibility issues.

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