It is an affirmative defense to a charge of violating ORS 475.752 by unlawfully possessing pseudoephedrine that the person:
(1) Obtained the pseudoephedrine lawfully;
(2) Possessed no more than six grams of pseudoephedrine, the salts, isomers or salts of isomers of pseudoephedrine or a combination of any of these substances; and
(3) Possessed the pseudoephedrine under circumstances that are consistent with typical medicinal or household use, as indicated by factors that include but are not limited to storage location, purchase date, possession of the products in a variety of strengths, brands, types or purposes and expiration date.