Is there sufficient evidence to sustain a conviction for possession of a controlled substance with intent to distribute?

Houston contends that there was insufficient evidence to sustain her conviction. In considering her argument, we must review the record in the light most favorable to the government. We must affirm the conviction if a rational factfinder could have found proof of each element of the crime beyond a reasonable doubt. United States v. Adler, 879 F.2d 473, 495 (9th Cir.1988). In this case, the government was required to establish beyond a reasonable doubt that the defendant knowingly possessed a controlled substance with intent to distribute. 21 U.S.C. Sec. 841(a)(1). Houston contends there was not sufficient evidence to show knowledge and possession. We conclude that there was sufficient evidence for convictions on both counts.