(720 ILCS 550/16.1) (from Ch. 56 1/2, par. 716.1)

Sec. 16.1. In any prosecution for any violation of this Act, it shall be an affirmative defense that the substance possessed by the defendant was regulated as a controlled substance under the Illinois Controlled Substances Act. In order to raise this affirmative defense, the defendant shall give notice thereof to the State not less than 7 days prior to trial.

(Source: P.A. 84-1313; 84-1362.)