Cal. Pub. Res. Code § 25513.3

Notwithstanding Sections 11425.30 and 11430.10 of the Government Code, unless a party demonstrates other statutory grounds for disqualification, a person who has served as investigator or advocate in an adjudicative proceeding of the commission under this code may serve as a supervisor of the presiding officer or assist or advise the presiding officer in the same proceeding if the service, assistance, or advice occurs more than one year after the time the person served as investigator or advocate, provided the content of any advice is disclosed on the record and all parties have an opportunity to comment on the advice.