D.C. Mun. Regs. tit. 23, r. 23-1714
In any proceeding before the Board, each party shall have the right to present in person or by counsel or designated representative, t he party's case or defense, including oral and documentary evidence, to submit rebuttal evidence, and to cross-examine witnesses, unless the matter at issues has been dismissed by the Board.
In a protest hearing in which there is more than one (1) protest, and the Board has required the protestants to designate one (1) person to conduct the protestant's case pursuant to § 1612.8, the designated individual shall present the protestant's case, give the opening and closing statements, and examine and cross-examine witnesses on behalf of the protestants.
Any member of the Board may question any witness at any time during or after examination or cross-examination, subject to objection by a party.
Any oral or documentary evidence may be received, but the Board shall exclude irrelevant, immaterial, or unduly repetitious evidence.
The Board may impose a time limitation on oral arguments and witness testimony as it deems appropriate.
The Board shall afford all parties the opportunity to present oral argument.
D.C. Mun. Regs. tit. 23, r. 23-1714