California Code, Business and Professions Code - BPC § 4980.60

(a) The board may adopt those rules and regulations as may be necessary to enable it to carry into effect the provisions of this chapter.  The adoption, amendment, or repeal of those rules and regulations shall be made in accordance with Chapter 3.5 (commencing with Section 11340) of Part 1 of Division 3 of Title 2 of the Government Code.

(b) The board may, by rules or regulations, adopt, amend, or repeal rules of advertising and professional conduct appropriate to the establishment and maintenance of a high standard of integrity in the profession, provided that the rules or regulations are not inconsistent with Section 4982.  Every person who holds a license to practice marriage and family therapy shall be governed by the rules of professional conduct.