D.C. Mun. Regs. tit. 31, § 608
608.1 All taxicab vehicles shall be inspected semi-annually, or at other times as required by the Commission for the following:
(a) Safe operating condition and compliance with District of Columbia motor vehicle regulations with respect to the condition of the body and fenders, cleanliness, repairs, and other mechanical parts relating to both the exterior and interior condition of the taxi vehicle; and
(b) Broken or damaged taximeter seals.
608.2 Any Hack Inspector, police officer or other authorized agent of the District may inspect and test the lights, brakes, steering assembly, tires, equipment, horn or any other device required by Title 18 DCMR and the Commission's rules and regulations at any time a taxicab is on the public streets or public space.
608.3 Any Hack Inspector, police officer or other authorized agent of the District may order the removal of an unsafe or improperly equipped taxicab from any public street or space to one of the official District Inspection Stations for reinspection notwithstanding the fact that the taxicab displays an approved inspection sticker.
608.4 No person shall drive, move, or permit the operation or use of any taxicab which is mechanically unsafe, improperly equipped, or otherwise unfit to be operated.
SOURCE: Final Rulemaking published at 37 DCR 3595, 3606 (June 1, 1990); as amended by Final Rulemaking published at 55 DCR 3831(April 11, 2008).