D.C. Mun. Regs. tit. 18, r. 18-500
The rules and regulations contained in this chapter shall govern the registration of new and used car dealers in the District of Columbia, the issuance and use of dealer tags and special use tags by dealers, and the maintenance of records by dealers.
No person, unless registered under the provisions of this chapter, shall carry on or conduct the business of a dealer in motor vehicles, trailers, or semitrailers of a type subject to registration.
All certificates of manufacture, certificates of title, papers issued by another jurisdiction in connection with titling and registration, registration cards, temporary registration certificates, records of issuance of temporary registration certificates, and triplicate copies of special use certificates, while in the possession of any dealer registered under this chapter, shall be subject to inspection upon demand of the Director or of any police officer.
All vehicles and places of business of dealers registered under this chapter shall be subject to inspection upon demand of the Director or of any police officer.
No dealer may accept an open assignment of a motor vehicle title or bill of sale that does not identify the dealer as the purchaser or assignee of the motor vehicle.
A dealer shall inform the Department of any change in business ownership or location within five (5) business days of any such change.
All dealers or their agents shall attend any mandatory training required by the Department after receiving notice of the training sent by regular mail to the address on the dealer's registration; except for good cause shown as determined by the Director.
D.C. Mun. Regs. tit. 18, r. 18-500