The salary fixed by law for each state officer, elective or appointive, is compensation in full for that office and for all services rendered in any official capacity or employment whatsoever, during his or her term of office, and he or she shall not receive for his or her own use any fee or perquisite for the performance of any official duty. The provisions of Section 19839 do not apply to any state officer whose salary is fixed by statute.
Ca. Gov. Code § 18000