Cal. Lab. Code § 123.6

(a) All workers’ compensation administrative law judges employed by the administrative director shall subscribe to the Code of Judicial Ethics adopted by the Supreme Court pursuant to subdivision (m) of Section 18 of Article VI of the California Constitution for the conduct of judges and shall not otherwise, directly or indirectly, engage in conduct contrary to that code or to the commentary to the Code of Judicial Ethics.
In consultation with the Commission on Judicial Performance, the administrative director shall adopt regulations to enforce this section. To the extent possible, the rules shall be consistent with the procedures established by the Commission on Judicial Performance for regulating the activities of state judges, and, to the extent possible, with the gift, honoraria, and travel restrictions on legislators contained in the Political Reform Act of 1974 (Title 9 (commencing with Section 81000) of the Government Code).
(b) Honoraria or travel allowed by the administrative director, and not otherwise prohibited by this section in connection with any public or private conference, convention, meeting, social event, or like gathering, the cost of which is significantly paid for by attorneys who practice before the board, may not be accepted unless the administrative director has provided prior approval in writing to the workers’ compensation administrative law judge allowing him or her to accept those payments.