California Code, Government Code - GOV § 31639.76

Notwithstanding Section 31639.7, a safety member described in subdivision (b) of Section 31470.2 may receive credit as a safety member for all or any part of the time during which he or she was not within the field of membership as a safety member to the extent and subject to the terms and conditions provided in a memorandum of understanding between the employer and the designated employee representative.

This section shall apply only to a county of the eighth class, as defined in Sections 28020 and 28029, both as amended by Chapter 1204 of the Statutes of 1971, if the board of supervisors in that county has elected to make subdivision (b) of Section 31470.2 applicable in the county.