California Code, Business and Professions Code - BPC § 18649

(a) The administration or use of any drugs, alcohol, stimulants, or injections in any part of the body or the use of any prohibited substance specified in the Prohibited List of the World Anti-Doping Code, as adopted by the World Anti-Doping Agency, by a professional or amateur boxer or martial arts fighter licensed by the commission shall be prohibited. The commission, in its discretion and pursuant to regulations adopted pursuant to the Administrative Procedure Act (Chapter 3.5 (commencing with Section 11340) of Part 1 of Division 3 of Title 2 of the Government Code), may determine the necessity of exemptions to this section for certain licensees.

(b) The commission may conduct testing at any time during the period of licensure for a professional or amateur boxer or martial arts fighter licensed by the commission to ensure compliance with subdivision (a).

(c) The commission may collect blood and urine specimens from a professional or amateur boxer or martial arts fighter licensed by the commission to detect the presence of any prohibited substances. Collection of specimens shall be done in the presence of authorized commission personnel.

(d) A professional or amateur boxer or martial arts fighter licensed by the commission, for which the presence of a prohibited substance is detected through testing by the commission, shall be in violation of this section and subject to the penalties described in Section 18843.