Cal. Lab. Code § 3364.5
Notwithstanding Section 3351 of the Labor Code, a volunteer, unsalaried person authorized by the governing board of a school district or the county superintendent of schools to perform volunteer services for the school district or the county superintendent shall, upon the adoption of a resolution of the governing board of the school district or the county board of education so declaring, be deemed an employee of the district or the county superintendent for the purposes of this division and shall be entitled to the workmen's compensation benefits provided by this division for any injury sustained by him while engaged in the performance of any service under the direction and control of the governing board of the school district or the county superintendent.
Ca. Lab. Code § 3364.5