What is sufficient evidence to convict a person for manufacturing methamphetamine?

First, there is sufficient evidence from which the jury could find that methamphetamine was manufactured at the site. Law enforcement personnel found traces of methamphetamine in various flasks and containers, empty containers of ephedrine (a precursor chemical), an acetone wash solution containing detectable amounts of methamphetamine, and other paraphernalia used in the manufacture of methamphetamine (e.g., separation flasks, litmus paper, a heating plate, and filters). See United States v. Calabrese, 825 F.2d 1342, 1345, 1348 (9th Cir.1987) (finding sufficient evidence to support conviction for manufacturing methamphetamine based largely on equipment containing trace amounts of methamphetamine seized on the defendant's premises).