CAL. GOV. CODE § 3543.4 : California Code - Section 3543.4

A person serving in a management position, senior management position, or a confidential position may not be represented by an exclusive representative. Any person serving in such a position may represent himself or herself individually or by an employee organization whose membership is composed entirely of employees designated as holding those positions, in his or her employment relationship with the public school employer, but, in no case, shall such an organization meet and negotiate with the public school employer. A representative may not be permitted by a public school employer to meet and negotiate on any benefit or compensation paid to persons serving in a management position, senior management position, or a confidential position.