CA Gov't Code Section 3580.5

(a)

Supervisory employees shall not participate in the handling of grievances on behalf of nonsupervisory employees. Nonsupervisory employees shall not participate in the handling of grievances on behalf of supervisory employees.

(b)

Supervisory employees shall not participate in meet and confer sessions on behalf of nonsupervisory employees. Nonsupervisory employees shall not participate in meet and confer sessions on behalf of supervisory employees.

(c)

The prohibition in subdivisions (a) and (b) shall not be construed to apply to the paid staff of an employee organization.

(d)

Supervisory employees shall not vote on questions of ratification or rejection of memoranda of understanding reached on behalf of nonsupervisory employees.