Business and Professions Code § 19814

(a) During their terms of office, the members of the commission shall not engage in any other business, vocation, or employment.

(b) Before entering upon the duties of his or her office, the chief and each member of the commission shall subscribe to the constitutional oath of office and, in addition, swear that he or she is not, and during his or her term of office shall not be, pecuniarily interested in, or doing business with, any person, business, or organization holding a gambling license.