California Code, Public Utilities Code - PUC § 1760

Notwithstanding Sections 1757 and 1757.1, in any proceeding wherein the validity of any order or decision is challenged on the ground that it violates any right of petitioner under the United States Constitution or the California Constitution, the Supreme Court or court of appeal shall exercise independent judgment on the law and the facts, and the findings or conclusions of the commission material to the determination of the constitutional question shall not be final.