410 ILCS 620/2.24

"Counterfeit drug" means a drug which, or the container or labeling of which, without authorization, bears the trademark, trade name or other identifying mark, imprint or device, or any likeness thereof, of a drug manufacturer, processor, packer or distributor other than the person or persons who in fact manufactured, processed, packed or distributed such drug and which thereby falsely purports or is represented to be the product of, or to have been packed or distributed by, such other drug manufacturer, processor, packer or distributor.