California Code, Government Code - GOV § 31497

(a) Except as provided in Section 31498.3 and under reciprocal provisions of this article, a member who was in public service prior to becoming a member may not elect to receive credit in this retirement plan for that public service time, and shall not receive credit for that prior public service.

(b) Absence from work or termination of employment while an eligible employee or disability beneficiary, as defined by a disability plan provided by the employer, shall not be considered as breaking the continuity of service.

(c) For the purposes of subdivision (b) of Section 31497.3, an unpaid leave of absence of not to exceed one year, or a leave of absence for which an employee receives any benefit which has been approved by the employer, shall not be considered an interruption of service. However, the period of time of unpaid leave shall not be considered as service in calculating the benefits otherwise provided under this article.