D.C. Mun. Regs. tit. 3, § 3704
3704.1 A full investigation regarding any alleged violation of the Act, and Chapters 30 - 37 of this Title, shall commence upon a finding of reasonable cause by the Director.
3704.2 Within ten (10) days after initiation of a full investigation, the Director shall notify, in writing, the person (respondent), who is the subject of the full investigation.
3704.3 Notification to the respondent shall consist of the following:
(a) A copy of the complaint;
(b) Explanation of the existence of the investigation and the general nature of the alleged violation; and
(c) An offer to the subject affording the opportunity to respond to the allegation(s).
3704.4 The full investigation shall be conducted by evidence gathered and explored by the following:
(a) Subpoena;
(b) Depositions;
(c) Interrogatories;
(d) Interviews;
(e) Audits;
(f) Affidavits;
(g) Documents; and
(h) Other means deemed appropriate.
3704.5 The Director may require any person to submit in writing certain reports and answers to questions, as prescribed by the Director, relating to the administration and enforcement of the Act, and Chapters 30 - 37 of this Title.
3704.6 Any person required by the Director to submit in writing certain reports or to answer questions, under § 3704.5, shall submit the reports or answers, within seven (7) calendar days after receipt of the request.
3704.7 All submissions of reports or answers, under § 3704.6, shall be made under oath; provided, that the person is not represented by counsel.
3704.8 Within ninety (90) days of receipt of any complaint, the Director shall perform one (1) of the following acts:
(a) Cause evidence to be presented to the Board, if sufficient evidence exists constituting an apparent violation, pursuant to § 3706; or
(b) Dismiss the complaint, if insufficient evidence exists to present the matter, pursuant to § 3705.
3704.9 The Director may seek, upon a showing of good cause, an extension of time as reasonably necessary to complete an investigation.
SOURCE: Final Rulemaking published at 45 D.C. Reg. 3161, 3205-06 (May 22, 1998); as amended by Final Rulemaking published at 53 D.C. Reg. 3242-3243 (April 21, 2006); and as amended by Final Rulemaking published at 57 D.C. Reg. 2272, 2273 (March 19, 2010).