D.C. Mun. Regs. tit. 15, r. 15-125
The Commission may, either on its own initiative, pursuant to a prehearing conference, or upon proper motion of a party to a proceeding, issue an order to take a deposition.
A motion to take a deposition shall be filed with the Commission no less than ten (10) days before the proposed date for taking the deposition, unless the Commission shall permit otherwise.
The motion shall set forth the reason for the deposition, the place and time of taking, the names and addresses of the deponents, and whether the deposition is to be based upon written interrogatories or upon oral examination.
If the deposition is to be based upon oral examination, the motion shall contain a statement of the subject-matter concerning which each deponent will testify.
If the deposition is to be based on written interrogatories, the motion shall be accompanied by the interrogatories to be propounded.
Copies of all motions to take depositions, and accompanying interrogatories, if any, shall be served on all parties.
A party served with a motion to take a deposition may object to the taking of the deposition by filing with the Commission and serving upon all parties within five (5) days after receipt of the motion to take a deposition, a notice of the objection stating the reasons therefor.
A party served with a motion to take a deposition on written interrogatories shall have five (5) days, or any other time as the Commission may permit, after receipt of service of that motion, within which to file and serve written cross- interrogatories.
An application to take a deposition in a foreign country shall be entertained when necessary or convenient, and authority to take such deposition shall be granted upon such notice and other terms and directions as are lawful and appropriate.
Depositions shall be filed with the Commission before they are offered as evidence. No deposition shall constitute a part of the record in any proceeding until received in evidence at a hearing, unless, prior to the final submission of the case, the Commission determines otherwise.
D.C. Mun. Regs. tit. 15, r. 15-125