D.C. Mun. Regs. tit. 3, § 716
716.1 If a voter makes a mistake in marking a ballot or erroneously defaces or tears a ballot, he or she may surrender the spoiled ballot to a polling place official, who shall furnish the voter with another ballot.
716.2 The polling place official shall request the voter to place the spoiled ballots into the spoiled ballot envelope.
716.3 The voter shall seal the envelope and shall return it to the polling official before an additional ballot can be issued.
716.4 A polling place official shall not issue more than three (3) ballots (one original, two replacements) to any voter.
SOURCE: Final Rulemaking published at 39 D.C. Reg. 2467, 2491-92 (April 10, 1992); as amended by Final Rulemaking published at 51 D.C. Reg. 7416 (July 30, 2004); as amended by Final Rulemaking published at 56 D.C. Reg. 5753, 5756 (July 17, 2009); and as amended by Final Rulemaking published at 57 D.C. Reg. 4245, 4266 (May 14, 2010).