California Code, Education Code - EDC § 22508.5

(a) Any person who is a member of the Defined Benefit Program of the State Teachers' Retirement Plan employed by a community college district who subsequently is employed by the Board of Governors of the California Community Colleges to perform duties that are subject to membership in a different public retirement system may elect to have that service subject to coverage by the Defined Benefit Program of this plan and excluded from coverage by the other public retirement system.  Only a person who has achieved plan vesting is eligible to elect to continue as a member of the program.

(b) A member of the Public Employees' Retirement System who is employed by the Board of Governors of the California Community Colleges who subsequently is employed by a community college district to perform creditable service subject to coverage under the Defined Benefit Program, may elect to have that service subject to coverage by the Public Employees' Retirement System and excluded from coverage under the Defined Benefit Program pursuant to Section 20309 of the Government Code.

(c) This section shall apply to changes in employment effective on or after January 1, 1998.