CA Gov't Code Section 31486.8

Any person employed subsequent to the effective date of this article who would otherwise qualify as a member shall not become a member until that person certifies to the board an election to be covered by the retirement plan established by this article or to be covered by the retirement provisions and benefits otherwise available to members on the date preceding the effective date of this article. As a condition of continued employment, the certification shall be made within 60 days of employment. The employer shall make available to the person a disclosure of the elements of each of the available retirement plans prior to accepting the election.