Cal. Const. art. III, § 3.5

An administrative agency, including an administrative agency created by the Constitution or an initiative statute, has no power: (a) To declare a statute unenforceable, or refuse to enforce a statute, on the basis of it being unconstitutional unless an appellate court has made a determination that such statute is unconstitutional; (b) To declare a statute unconstitutional; (c) To declare a statute unenforceable, or to refuse to enforce a statute on the basis that federal law or federal regulations prohibit the enforcement of such statute unless an appellate court has made a determination that the enforcement of such statute is prohibited by federal law or federal regulations. (Sec. 3.5 added June 6, 1978, by Prop. 5. Res.Ch. 48, 1977.)