Does the testimony of a single witness undermine the credibility of the witnesses?

Murillo does not dispute the fact that the jury was told all of the facts which Murillo contends undermines the witnesses' credibility. Moreover, the testimony of a single witness, even an informant, is sufficient to uphold a conviction. United States v. Larios, 640 F.2d 938, 940 (9th Cir.1981). In addition, the intent to distribute a controlled substance may be reasonably inferred from the possession of quantities larger than that required for personal use. United States v. Glenn, 667 F.2d 1269, 1272 (9th Cir.1982).