What is the test for sufficiency of evidence in a motion to overturn a methamphetamine possession charge?

Smith contends that the evidence presented at trial was not sufficient to convict him under 21 U.S.C. 841(a)(1). Specifically, he says that the 27.7 grams of methamphetamine seized by federal agents at the time of his arrest were for personal use rather than distribution. When reviewing a challenge to a conviction for sufficiency of the evidence, we view the evidence in the light most favorable to the prosecution to determine whether "any rational trier of fact could have found the essential elements of the crime beyond a reasonable doubt." United States v. Torres-Rodriguez, 935 F.2d 1047, 1048 (9th Cir.1991) (citations omitted) (emphasis in original).