California Code, Business and Professions Code - BPC § 3703

(a) The settings in which respiratory care may be practiced include licensed health care facilities, hospitals, clinics, ambulatory or home health care, physicians' offices, nurse practitioners' offices, and public or community health services. Respiratory care may also be provided during the transportation of a patient, and under any circumstances where an emergency necessitates respiratory care.

(b) The practice of respiratory care shall be performed under the supervision of a medical director in accordance with a prescription of a physician and surgeon or pursuant to respiratory care protocols as specified in Section 3702.