(a) Proof that a person had in his possession more than 40 grams or 15 packages of any drug containing ephedrine, pseudoephedrine or phenylpropanolamine, or any of their salts, optical isomers or salts of optical isomers as an active ingredient shall give rise to a rebuttable presumption that the person acted with intent to manufacture methamphetamine.

(b) Proof that a person had in his possession any amount of ephedrine, pseudoephedrine or phenylpropanolamine, or any of their salts, optical isomers or salts of optical isomers and at the same time possessed any amount of any other precursor or reagent substance under section 13.1¹ shall give rise to a rebuttable presumption that the person acted with intent to manufacture methamphetamine.

(c) The provisions of this section shall not apply to a licensed pharmaceutical manufacturer, wholesaler, or the sales representative of a licensed manufacturer or wholesaler, or to a licensed pharmacist or licensed health care professional, or to any other person engaged by a licensed manufacturer, wholesaler, pharmacist or health care provider, who lawfully markets, transports, delivers or dispenses a product containing ephedrine, pseudoephedrine or phenylpropanolamine, or any of their salts, optical isomers or salts of optical isomers.