D.C. Mun. Regs. tit. 18, § 609
609.1 Inspection of non-registered motor vehicles for which no fee shall be charged shall be limited to the following purposes:
(a) Verification of identification numbers when required under this section, unless verification can be made as provided in § 401.15; and
(b) Cases in which the safe mechanical condition of a vehicle is questioned by the police or other authority.
609.2 Except as provided in § 609.1, any motor vehicle not registered in the District of Columbia that is inspected shall pay inspection fees in accordance with §§ 601.16 and 601.17.
609.3 Fees for the inspection of a motor vehicle that is not registered in the District shall be paid at the time of the inspection.
SOURCE: Regulation No. 72-13, effective June 30, 1972, published at 19 DCR 61 (July 24, 1972), which adopted the Special Edition of the D.C. Register entitled “Title 32, Department of Motor Vehicles, Motor Vehicle Regulations for the District of Columbia” into Title 32 of the District of Columbia Rules and Regulations (DCRR); 32 DCRR § 4.302, Special Edition; as amended by Final Rulemaking published at 48 DCR 1150 (February 9, 2001); as amended by Final Rulemaking published at 48 DCR 6261 (July 13, 2001).