Section 11704 Of Division 10.2. Drug Dealer Liability Act From California Health And Safety Code >> Division 10.2.

. (a) A person who knowingly participates in the marketing of illegal controlled substances within this state is liable for civil damages as provided in this division. A person may recover damages under this division for injury resulting from an individual's use of an illegal controlled substance.
  (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 marketing of illegal controlled substances, if the participation is in furtherance of an official investigation.