http://www.leginfo.ca.gov/const-toc.html

CALIFORNIA CONSTITUTION ARTICLE 3 STATE OF CALIFORNIA

SEC. 3. The powers of state government are legislative, executive, and judicial. Persons charged with the exercise of one power may not exercise either of the others except as permitted by this Constitution.

CALIFORNIA CONSTITUTION ARTICLE 3 STATE OF CALIFORNIA

SEC. 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.