27 C.F.R. § 771.99
The administrative law judge is charged with the duty of conducting a fair and impartial hearing and of maintaining order in form and manner consistent with the dignity of a court proceeding. In the event that counsel or any person or witness in any proceeding shall refuse to obey the orders of the administrative law judge, or be guilty of disorderly or contemptuous language or conduct in connection with any hearing, the administrative law judge may, for good cause stated in the record, suspend the hearing, and, in the case of disorderly or contemptuous language or conduct by an attorney, report the matter to the Department of Justice, Office of Professional Responsibility. See28 CFR 0.39a(a)(9) . The refusal of a witness to answer any question that has been ruled to be proper shall be considered by the administrative law judge in determining the weight to be given all the testimony of that witness.
27 C.F.R. §771.99