No informality in any proceeding or in the manner of taking testimony shall invalidate any order, decision, award, or rule made and filed as specified in this division. No order, decision, award, or rule shall be invalidated because of the admission into the record, and use as proof of any fact in dispute, of any evidence not admissible under the common law or statutory rules of evidence and procedure.
(Amended by Stats. 1951, Ch. 778, Sec. 9.)