California Code, Education Code - EDC § 49409

Notwithstanding any provision of any law, no physician and surgeon who in good faith and without compensation renders voluntary emergency medical assistance to a participant in a school athletic event or contest at the site thereof, or during transportation to a health care facility, for an injury suffered in the course of the event or contest, shall be liable for any civil damages as a result of any acts or omissions by the physician and surgeon in rendering the emergency medical care.  The immunity granted by this paragraph shall not apply in the event of an act or omission constituting gross negligence.