D.C. Mun. Regs. tit. 18 § 737
No motor vehicle manufactured for the 1966 Model Year or subsequent years and registered as a private passenger vehicle, except motorcycles or motor-driven cycles, shall be approved on inspection under the provisions of § 503 of this title unless its front seating arrangement (bench or bucket type) is equipped with at least two (2) safety belts or safety harnesses of a type approved by the Director, who shall maintain a list of approved devices.
No motor vehicle manufactured after January 1, 1968 and registered as a private passenger vehicle, taxicab, or for livery or sightseeing purposes; except motorcycles, motor-driven cycles, or buses; shall be approved on inspection under the provisions of § 503 of this title unless safety belts or safety harnesses of a type approved by the Director are installed in each seat position with the exception of jump seats.
As used in § 736.2, the term "jump seat" means a seat intended for the accommodation of one (1) person and designed to be folded forward into a recess in the vehicle.
All seat belts or safety harnesses, including the installation and anchorages thereof, shall meet or exceed the standards and specifications published by the United States Department of Commerce and the Society of Automotive Engineers applicable to such equipment, installation, and anchorages current at the time such devices are installed.
All seat belts or safety harnesses installed as required by this section shall be continuously maintained to conform to the standards specified in § 736.4.
No person shall distribute, have for sale, offer for sale, sell, or install any seat belt or safety harness which does not comply with the requirements of this section.
D.C. Mun. Regs. Tit. 18, § 737