C.R.S. § 18-18-412.5

(1) The general assembly finds and declares that persons are manufacturing methamphetamine and amphetamine using nonprescription drugs that are readily and legally available. The general assembly further finds that it is necessary to make illegal the possession of such nonprescription drugs with the intent to use them as immediate precursors in manufacturing any controlled substance. (2) Notwithstanding any other provision of law to the contrary, no person shall possess ephedrine, pseudoephedrine, or phenylpropanolamine, or their salts, isomers, or salts of isomers, with the intent to use such product as an immediate precursor in the manufacture of any controlled substance. (3) A person who violates the provisions of this section commits a level 2 drug felony.