California Code, Business and Professions Code - BPC § 17500.1

Notwithstanding any other provision of law, no trade or professional association, or state agency, state board, or state commission within the Department of Consumer Affairs shall enact any rule, regulation, or code of professional ethics which shall restrict or prohibit advertising by any commercial or professional person, firm, partnership or corporation which does not violate the provisions of Section 17500 of the Business and Professions Code, or which is not prohibited by other provisions of law.

The provisions of this section shall not apply to any rules or regulations heretofore or hereafter formulated pursuant to Section 6076.