(a) Except as provided in subdivision (b), any narcotic controlled substance employed in treating an addict 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 his or her physician and surgeon supervisor approved pursuant to Section 3515 of the Business and Professions Code.
(b) When acting under the direction of a physician and surgeon, the following persons may administer a narcotic controlled substance orally in the treatment of an addict 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.