D.C. Mun. Regs. tit. 1, r. 1-1522
The use of records in the Archives shall be subject to restrictions prescribed by statute or court order, and to restrictions imposed by the agency which transferred the records or by the donor of historical materials.
The Archivist shall impose agency restrictions on access to its records in cases where the head of the agency has stated in writing that such restrictions are in the public interest. Agency heads shall justify the restrictions, and shall cite the statute or Freedom of Information Act exemption that authorizes the imposing of restrictions on the use or examination of the records.
Such restrictions shall not remain in effect more than thirty (30) years after the records were created unless the Archivist, with the approval of the Administrator, determines for specific records that the restrictions shall remain in force for a longer period.
The Archivist shall not authorize the opening of any records ordered sealed by a court.
D.C. Mun. Regs. tit. 1, r. 1-1522