For purposes of this Chapter, the following words and phrases shall have the following meanings:
(a) Synthetic Drug. The term "synthetic drug" means one (1) or more of the following:
(1) A substance that a reasonable person would believe is a synthetic drug;
(2) A substance that a reasonable person would believe is being purchased, sold or given away as a synthetic drug;
(3) A substance which has been listed as a regular synthetic drug in the Wisconsin Statutes or Village ordinances, and their derivatives, analogues, homologues, salts, optical isomers and salts of optical isomers with substantially similar chemical structure and pharmacological activity as a synthetic drug or other controlled substance; or
(4) A substance that a person knows or should have known was intended to be consumed by ingestion, inhalation, injection or any other immediate means, and consumption was intended to cause or simulate a depressant, stimulant or hallucinogenic effect on the central nervous system that is substantially similar to or greater than the depressant, stimulant or hallucinogenic effect on the central nervous system of a controlled substance on Schedule I through Vas defined in Chapter 961, Wis. Stats. "Synthetic drug" does not mean legal food or drug ingredients, prescription drugs, alcohol, tobacco or dietary supplements.
(b) Synthetic Drug Establishment. Any business establishment where a person engages in the sale or giving away of synthetic drugs.