740 ILCS 57/20: Liability for participation in the illegal drug market.

(a) A person who knowingly participates in the illegal drug market within this State is liable for civil damages as provided in this Act. A person may recover damages under this Act for injury resulting from an individual's use of an illegal drug.

(b) A law enforcement officer or agency, the State, or a person acting at the direction of a law enforcement officer or agency or the State is not liable for participating in the illegal drug market if the participation is in furtherance of an official investigation.