D.C. Mun. Regs. tit. 23, § 1713
1713.1 Documentary evidence offered at any hearing before the Board shall, if received by the Board, be retained by the Board, and may be examined by interested persons pursuant to § 1708.
1713.2 Any party who offers documentary evidence shall, at the hearing, provide copies to each opposing party.
1713.3 The Board may, in its discretion, permit the withdrawal of original documents received into evidence and the substitution of certified copies in lieu of the originals.
1713.4 When relevant and material matters offered into evidence are contained in a book or other document which also contains other matters not material or relevant, the person offering the evidence shall plainly designate the matters offered, and the immaterial and irrelevant parts shall be excluded and segregated insofar as practicable.
SOURCE: Final Rulemaking published at 51 DCR 4309 (April 30, 2004); as amended by Final Rulemaking published at 55 DCR 12991 (December 26, 2008).