California Code, Labor Code - LAB § 1177

(a) The commission may make and enforce rules of practice and procedure and shall not be bound by the rules of evidence. Each order of the commission shallbe concurred in by a majority of the commissioners.

(b) The commission shall prepare a statement as to the basis upon whichan adopted or amended order is predicated. The statement shall be concurred in by a majority of the commissioners.The commission shall publish a copy of the statement with the order in the California Regulatory Notice Register. The commission also shall provide a copy of the statement to any interested party upon request.