D.C. Mun. Regs. tit. 18, r. 18-604
If, upon inspection of any vehicle, the Director determines it does not conform to the standards in the current edition of the "Lane Operator's Manual", or when applicable, the current edition of the "AAMVA Manual" and this Title, the Director shall issue to the registrant or person desiring registration a rejection sticker.
[REPEALED]
If a rejection sticker is issued, the operation and use of the vehicle will be permitted for twenty (20) days from the date of issuance; Provided, that the registrant or the person desiring registration to whom the rejection sticker was issued continues to hold legal title to the vehicle; and Provided further, that the registrant or other person has complied with this title and all other applicable provisions of law.
A registrant, or any person desiring registration, to whom a rejection sticker was issued shall not park or permit the parking of the vehicle on any public space after the expiration date of the rejection sticker.
In the event a registrant or a person who desires registration, and to whom a rejection sticker was issued, loses or disposes of legal title to the vehicle, the person, or his or her agent who acquires it, may operate the vehicle during the remainder of the twenty (20) day period provided in § 604.3.
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If a motor vehicle fails the emissions testing portion of the mechanical inspection, it shall be issued a rejection sticker pursuant to § 604.1.
Under § 603.1, a vehicle failing the emissions testing portion of the mechanical inspection shall not qualify for issuance of an approval sticker even if it meets all safety -related portion of the inspection.
An approval sticker shall only be issued upon the vehicle's passing an emissions test.
D.C. Mun. Regs. tit. 18, r. 18-604