27 C.F.R. § 771.96
An administrative law judge shall, at any time, withdraw from any proceeding if he deems himself disqualified. Upon the filing in good faith by the applicant, licensee, permittee, or Attorney for the Government of a timely and sufficient affidavit of facts showing personal bias or otherwise warranting the disqualification of any administrative law judge, if the administrative law judge fails to disqualify himself, the Director shall upon appeal, as provided in § 771.120, determine the matter as a part of the record and decision in the proceeding. If the Director decides the administrative law judge should have deemed himself disqualified, the Director will remand the record for hearing de novo before another administrative law judge. If the Director should decide against the disqualification of the administrative law judge, the proceeding will be reviewed on its merits by the original administrative law judge. The burden is upon the party seeking disqualification to set forth evidence sufficient to overcome the presumption of the administrative law judge's honesty and integrity.
27 C.F.R. §771.96