California Code, Government Code - GOV § 20355

Wherever in this part the rights of a member, because of membership in another retirement system, are conditioned upon employment within 90 days of termination of membership in this system or another retirement system, with respect to that employment that occurs on and after January 1, 1976, the period shall be six months rather than 90 days.

This section shall also be applicable to members who were permanent employees of the state who were laid off because of a reduction in work force and whose break in service between retirement systems occurred prior to January 1, 1976, but not before April 1, 1970.