Wis. Stat. § 961.65: Possessing materials for manufacturing methamphetamine.

Except as authorized by this chapter, any person who possesses an ephedrine or pseudoephedrine product, red phosphorus, lithium metal, sodium metal, iodine, anhydrous ammonia, or pressurized ammonia with intent to manufacture methamphetamine is guilty of a Class H felony. Possession of more than 9 grams of ephedrine or pseudoephedrine, other than pseudoephedrine contained in a product to which s. 961.01 (20c) (a) or (b) applies, creates a rebuttable presumption of intent to manufacture methamphetamine. In this section, “ephedrine” and “pseudoephedrine” include any of their salts, isomers, and salts of isomers.