California Code, Government Code - GOV § 9355.45

(a) Every legislative statutory officer may become a member of this system. Every such officer in office at the time this section becomes effective may, within 90 days after the effective date, file with the board a written election to become a member of this system. Every such officer, elected after the effective date of this section, may file an election within 90 days after the commencement of the first term of office for which he or she is elected after attaining status as a legislative statutory officer. Upon the filing of the election he or she becomes a member of this system on the first day of the month following the filing of the election.

(b) This section shall not apply to any person who first becomes a legislative statutory officer on or after January 1, 2013.