Cal. Welf. & Inst. Code § 4418

The State Department of Developmental Services may obtain psychiatric, medical and other necessary aftercare services for judicially committed patients on leave of absence from state hospitals by contracting with any city, county, local health district, or other public officer or agency, or with any private person or agency to furnish such services to patients in or near the home community of the patient. Any city, county, local health district, or other public officer or agency authorized by law to provide mental health and aftercare services is authorized to enter such contracts.