California Code, Education Code - EDC § 44913

Nothing in Sections 44882 to 44887, inclusive, Sections 44890,  144891,  1Sections 44893 to 44906, inclusive, and Sections 44908 to 44919, inclusive, shall be construed as permitting a certificated employee to acquire permanent classification with respect to employment in a summer school maintained by a school district, and service in connection with any such employment shall not be included in computing the service required as a prerequisite to attainment of, or eligibility to, classification as a permanent employee of the district. The provisions of this section do not constitute a change in, but are declaratory of, the preexisting law.