"TREATMENT OF CONTROLLED SUBSTANCE ANALOGUES"
"SEC 203. A controlled substance analogue shall, to the extent intended for human consumption, be treated, for the purposes of this title [Title I; "Enforcement"] and title III ["Interdiction"] as a controlled substance in schedule I."

"(32)(A) Except as provided in subparagraph (B), the term `controlled substance analogue' means a substance ---

"(i) the chemical structure of which is substantially similar to the chemical structure of a controlled substance in schedule I or II;
"(ii) which has a stimulant, depressant, or hallucinogenic effect on the central nervous system that is substantially similar to or greater than the stimulent, [sic] depressant, or hallucinogenic effect on the central nervous system of a controlled substance in schedule I or II; or
"(iii) with respect to a particular person, which such person represents or intends to have a stimulant, depressant, or hallucinogenic effect on the central nervous system that is substantially similar to or greater than the stimulant, depressant, or hallucinogenic effect on the central nervous system of a controlled substance in schedule I or II.

"(B) Such term does not include ---

"(i) a controlled substance;
"(ii) any substance for which there is an approved new drug application;
"(iii) with respect to a particular person any substance, if an exemption is in effect for investigational use, for that person, under section 505 of the Federal Food, Drug, and Cosmetic Act (21 U.S.C. 355) to the extent conduct with respect to such substance is pursuant to such exemption; or
"(iv) any substance to the extent not intended for human consumption before such an exemption takes effect with respect to that substance.".