D.C. Mun. Regs. tit. 31, r. 31-1323
Installation of a taximeter shall include the affixing of security seals to the taximeter as required by the Commission. Only seals which have been authorized and approved by the Commission shall be used by a taximeter business. The security seals shall be installed in a manner prescribed by the Commission, and in such manner that the security seals self-destruct when the taximeter or sealed part of the vehicle is disassembled.
Each seal shall be numbered and the taximeter business shall keep a record of each seal used. Seals must be used in consecutive numerical order, and any seal not used must be accounted for. The record of seals shall be available for inspection by the Commission as set forth herein. The record shall contain, at a minimum, the following information:
No taximeter business shall install a seal on a taximeter without removing all seals installed by another meter shop, whether or not broken.
Each taximeter business shall maintain on its business premises either a fireproof safe secured to the floor of the establishment or a locked, secured room secured by an alarm connected to a centralized monitoring facility, for the storage of seals and taximeter repair records.
Each taximeter business shall maintain and file with the Commission a description of the procedures used by it to prevent the loss, theft, destruction or misuse of taximeter seals.
A taximeter business shall not install a meter or seal in a taxicab that it owns or with which it is affiliated.
D.C. Mun. Regs. tit. 31, r. 31-1323