34 CFR §81.5

1. (a)An ALJ assigned to a case conducts a hearing on the record. The ALJ regulates the course of the proceedings and the conduct of the parties to ensure a fair, expeditious, and economical resolution of the case in accordance with applicable law.
2. (b)An ALJ is bound by all applicable statutes and regulations and may neither waive them nor rule them invalid.
3. (c)An ALJ is disqualified in any case in which the ALJ has a substantial interest, has been of counsel, is or has been a material witness, or is so related to or connected with any party or the party's attorney as to make it improper for the ALJ to be assigned to the case.
4. (d)
   1. (1)An ALJ may disqualify himself or herself at any time on the basis of the standards in paragraph (c) of this section.
   2. (2)A party may file a motion to disqualify an ALJ under the standards in paragraph (c) of this section. A motion to disqualify must be accompanied by an affidavit that meets the requirements of 5 U.S.C. 556(b). Upon the filing of such a motion and affidavit, the ALJ decides the disqualification matter before proceeding further with the case.