D.C. Mun. Regs. tit. 15, r. 15-134
The Federal Rules of Evidence shall be applied in formal hearings; Provided, that the presiding officer, or the Commission may, after informing the parties of an intention to do so, relax those rules in any hearing when, in his, her, or its judgment, the ends of justice would be better served by so doing.
Formal exceptions to rulings of the presiding officer, or of the Commission, are unnecessary. It is sufficient that a party, at the time the ruling is made or sought, makes known the action which he or she desires to be taken, or his or her objection to an action taken, and his or her grounds for such action or objection.
The Commission may, in its discretion, limit the cross-examination of any witness.
Where written matter offered in evidence is embraced in a document containing another matter which is not intended to be offered in evidence, the offering party shall present the original document for inspection at the hearing, and shall offer an exact copy of the matter which is to be introduced, unless the presiding officer, or the Commission, determines that the matter is short enough to be read into the record. Other parties shall be afforded opportunity to introduce in evidence, in like manner, other portions of the original document.
When any portion of the record before a body other than the Commission is offered in evidence, true copies of that portion shall be presented for the record in the form of an exhibit, or that portion may, without objection, be incorporated in the record by reference.
For purposes of this section, true copies of the official record of the Commission may be certified in writing by the Commission Secretary or by any attorney authorized to practice before the Commission.
D.C. Mun. Regs. tit. 15, r. 15-134