D.C. Mun. Regs. tit. 31, r. 31-347
Evidence presented at a hearing shall be limited to material evidence relevant to the issues as drawn by the pleadings or other documents filed in the case, subject to later modifications of the issues which may be necessary to prevent injustice.
Irrelevant, immaterial, or unduly repetitious evidence shall be excluded.
The rules of evidence applied in the hearing or review shall include exclusion of evidence whether hearsay or otherwise which does not contain facts of probative value or is not relevant to the issues to be decided.
No license shall be suspended or revoked solely on the basis of hearsay evidence.
Objections to the admission or exclusion of evidence shall be in short form, stating the grounds of objections relied upon.
Exceptions to the rulings of the Chairperson made during the course of a hearing are unnecessary. For all purposes for which an exception otherwise would be taken, it shall be sufficient that a party, at the time the ruling of the Chairperson is made or sought do the following:
Any offer of proof made in connection with an objection taken to any ruling of the Chairperson rejecting or excluding proffered oral testimony shall consist of a statement of the substance of the evidence which a party or his or her counsel contends would be adduced by such testimony.
If the excluded evidence consists of evidence in documentary or written form or of references to documents or records, a copy of the evidence shall be marked for identification and shall constitute the offer of proof.
The Chairperson may exclude testimony under the rules of privilege recognized by decisions of the courts of the District of Columbia or as provided by law including, but not limited to, communications between attorney and client, physician and patient, and records and files of any official or agency of government which, by statute or otherwise, are recognized as confidential.
No greater exclusionary effect shall be given any such rule or privilege than would apply in any action in a court of the District of Columbia.
D.C. Mun. Regs. tit. 31, r. 31-347