California Code, Health and Safety Code - HSC § 11847

(a) Existing fragmented, uncoordinated, and duplicative narcotic and alcohol and other drug programs be molded into a comprehensive and integrated statewide program for the prevention of narcotic and alcohol and other drug use and for the care, treatment, and rehabilitation of persons with a substance use disorders.

(b) Responsibility and authority for planning programs and activities for prevention, care, treatment, and rehabilitation of persons with a substance use disorder be concentrated in the department. It is the intent of the Legislature to assign responsibility and grant authority for planning alcohol and other drug prevention, care, treatment, and rehabilitation programs to the department, whose functions shall be subject to periodic review by the Legislature and appropriate federal agencies.

(c) The department succeeds to, and is vested with, all the duties, powers, purposes, responsibilities, and jurisdiction with regard to substance use disorder formerly vested in the State Department of Alcohol and Drug Programs.