Roderick Stutts was convicted by a jury on four counts of possession with intent to *496 distribute cocaine base, and he was sentenced to 121 months of imprisonment on each count to run concurrently and five years of supervised release. Stutts argues that the Government failed to authenticate or establish the chain of custody for the cocaine. Stutts contends that the prosecution introduced no evidence from Clarence Ward that the drugs introduced into evidence were in fact purchased from him. Ward testified that each time he purchased crack cocaine from Stutts, he immediately turned over the drugs to a task force agent, and his testimony was corroborated by the agents. Stutts has not shown that the jury could not have decided that the evidence was what the Government claimed it to be. See United States v. Casto, 889 F.2d 562, 568-69 (5th Cir. 1989). Stutts has not demonstrated that the district court abused it discretion in admitting the drug exhibits. See United States v. Polasek, 162 F.3d 878, 883 (5th Cir. 1998).

Stutts argues that the evidence was insufficient to support the verdict because the only evidence of his guilt came from Ward, “a paid informant, whose testimony was so inherently unreliable, unreasonable and improbable that no reasonable juror should have credited it.” Stutts’ argument is based on the alleged lack of credibility of Ward. This court’s review for sufficiency of the evidence is not concerned with the credibility of witnesses or the weight of the evidence, which is the exclusive province of the jury. United States v. Garcia, 995 F.2d 556, 561 (5th Cir. 1993). As the Government points out, the jury was made aware of Ward’s prior convictions, the current charges pending against him, and the fact that he was a paid informant, all factors that bore on his credibility. The jury chose to believe Ward, and this court does not reweigh such a decision. The judgment of the district court is AFFIRMED.