California Code, Health and Safety Code - HSC § 1797.222

A county, upon the recommendation of its local EMS agency, may adopt ordinances governing the transport of a patient who is receiving care in the field from prehospital emergency medical personnel, when the patient meets specific criteria for trauma, burn, or pediatric centers adopted by the local EMS agency.

The ordinances shall, to the extent possible, ensure that individual patients receive appropriate medical care while protecting the interests of the community at large by making maximum use of available emergency medical care resources. These ordinances shall be consistent with Sections 1797.106, 1798.100, and 1798.102, and shall not conflict with any state regulations or any guidelines adopted by the Emergency Medical Service Authority.

This section shall not be construed as prohibiting the helicopter program of the Department of the California Highway Patrol from a role in providing emergency medical services when the best medically qualified person at the scene of an accident determines it is in the best interests of any injured party.