California Labor Codes 3600.3
§ 3600.3 Off duty peace officers
(a) For the purposes of Section 3600, an off-duty peace officer, as defined in subdivision (b), who is performing, within the jurisdiction of his or her employing agency, a service he or she would, in the course of his or her employment, have been required to perform if he or she were on duty, is performing a service growing out of and incidental to his or her employment and is acting within the course of his or her employment if, as a condition of his or her employment, he or she is required to be on call within the jurisdiction during off-duty hours.
(b) As used in subdivision (a), 'peace officer' means those employees of the Department of Forestry and Fire Protection named as peace officers for purposes of subdivision (b) of Section 830.37 of the Penal Code.
(c) This section does not apply to any off-duty peace officer while he or she is engaged, either as an employee or as an independent contractor, in any capacity other than as a peace officer.