D.C. Mun. Regs. tit. 31, § 1311
1311.1 A taximeter business owner shall properly maintain all equipment required by the Commission, or any other equipment required by law or regulation, in good working order, and in such a manner that an inspection, test, or calibration may be conducted in conformity with these rules.
1311.2 A taximeter business shall not conduct any test, calibration, or installation using equipment that is not in good working order.
SOURCE: Final Rulemaking published at 55 DCR 3831 (April 11, 2008).