Cal. HSC § 11215

(a) Except as provided in subdivision (b), any narcotic controlled substance employed in treating a person with substance use disorder for addiction shall be administered by: (1) A physician and surgeon. (2) A registered nurse acting under the instruction of a physician and surgeon. (3) A physician assistant licensed pursuant to Chapter 7.7 (commencing with Section 3500) of Division 2 of the Business and Professions Code acting under the patient-specific authority of their physician and surgeon. (b) When acting under the direction of a physician and surgeon, the following persons may administer a narcotic controlled substance in the treatment of a person with substance use disorder for addiction to a controlled substance: (1) A psychiatric technician licensed pursuant to Chapter 10 (commencing with Section 4500) of Division 2 of the Business and Professions Code. (2) A vocational nurse licensed pursuant to Chapter 6.5 (commencing with Section 2840) of Division 2 of the Business and Professions Code. (3) A pharmacist licensed pursuant to Chapter 9 (commencing with Section 4000) of Division 2 of the Business and Professions Code. (c) Except as permitted in this section, no person shall order, permit, or direct any other person to administer a narcotic controlled substance to a person being treated for addiction to a controlled substance.