The following excerpt is from U.S. v. Geston, 299 F.3d 1130 (9th Cir. 2002):
We have held that it is reversible error for a witness to testify over objection whether a previous witness was telling the truth. United States v. Sanchez-Lima, 161 F.3d 545, 548 (9th Cir.1998). "It is the jurors' responsibility to determine credibility by assessing the witnesses and witness testimony in light of their own experience." Id. (citation omitted). "Testimony regarding a witness' credibility is prohibited unless it is admissible as character evidence." Id. (citation omitted).
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