29 C.F.R. § 18.605 Competency of judge as witness.
Title 29 - Labor
The judge presiding at the hearing may not testify in that hearing as a witness. No objection need be made in order to preserve the point.
Title 29: Labor
PART 18—RULES OF PRACTICE AND PROCEDURE FOR ADMINISTRATIVE HEARINGS BEFORE THE OFFICE OF ADMINISTRATIVE LAW JUDGES
Subpart B—Rules of Evidence
Witnesses
§ 18.605 Competency of judge as witness.