Cal. Gov. Code § 31558.6
Notwithstanding any of the provisions of Section 31558 to the contrary, each person who is employed in a position, the principal duties of which consist of juvenile hall group counseling and group supervision as defined in Section 31469.4, on the date the provisions of Section 31469.4 are made applicable in a county by the board of supervisors and who files with the board written election to become a safety member on or prior to one year after the date the provisions of Section 31469.4 are made applicable in a county by the board of supervisors, shall become a safety member.
Thereafter each person when employed in such position, shall become a safety member on the first day of the calendar month following his or her entrance into the service.
Ca. Gov. Code § 31558.6