D.C. Mun. Regs. tit. 3, § 501
501.1 A person who is absent from the District shall qualify as a federal elector, to vote in federal elections conducted in the District of Columbia, under the provisions of the Voting Rights Act of 1965, as set forth in § 501.2.
501.2 For purposes of this title, a "qualified federal elector" is a citizen of the United States residing outside of the District of Columbia who meets the following requirements:
(a) Resided or was domiciled in the District of Columbia who has moved into another state or territory and does not meet the voter registration residency requirements of that state or territory;
(b) Is at least seventeen (17) years of age and will be eighteen (18) years of age on or before the next general election;
(c) Has not been adjudged legally incompetent to vote; and
(d) Is not incarcerated for conviction of a felony in the District.
SOURCE: Final Rulemaking published at 43 D.C. Reg. 1078, 1080 (March 1, 1996); as amended by Final Rulemaking published at 57 D.C. Reg. 3267, 3270 (April 16, 2010); as amended by Notice of Emergency and Proposed Rulemaking published at 7 DCR 7690 (August 20, 2010)[EXPIRED]; as amended by Notice of Final Rulemaking published at 57 DCR 11111, 11114(November 26, 2010).