D.C. Mun. Regs. tit. 1, § 2817
2817.1 The party initiating the case may move to dismiss the case at any time, and the Administrative Law Judge may grant the motion without waiting for a response from the opposing side.
2817.2 An opposing party who objects to the voluntary dismissal of a case may file a motion for reconsideration as provided in Section 2828.
2817.3 The parties may file a joint motion for dismissal of a case with or without prejudice.
2817.4 Dismissal under this Section shall be without prejudice, unless an Administrative Law Judge orders otherwise. A dismissal with prejudice may occur:
(a) If the party requesting dismissal has previously dismissed the claim;
(b) If the motion for dismissal is made pursuant to a settlement that does not specifically require dismissal without prejudice; or
(c) In order to prevent harm to the other side.
SOURCE: Final Rulemaking published at 51 DCR 6399 (June 25, 2004); as amended by of Final Rulemaking published at 57 DCR 12541 (December 31, 2010); as amended by Final Rulemaking published at 63 DCR 6556 (April 29, 2016).