D.C. Mun. Regs. tit. 26, r. 26-A3809
All persons present at a hearing shall conduct themselves in a manner consistent with the standards of decorum commonly observed in the District of Columbia courts. The Commissioner or designated hearing officer may issue orders appropriate to maintain order, including the exclusion of a disorderly person from the hearing. If the person excluded is a party or its representative, the Commissioner may decide against the party with prejudice.
In a proceeding before the Commissioner or designated hearing officer, an individual may appear in his or her own behalf; a receiver or trustee may appear in such capacity; a general partner of a partnership may represent the partnership; an officer or director of a corporation may represent the corporation; an officer or director of an association may be represent the association; and a duly authorized official of any District, Federal, or State governmental agency may represent such agency.
A party has the right to waive the right to be present at the hearing, and may be represented by counsel who shall be licensed by the highest court of the District or any state.
D.C. Mun. Regs. tit. 26, r. 26-A3809