D.C. Mun. Regs. tit. 16, r. 16-1421
A motor vehicle dealer shall provide each prospective consumer of a used motor vehicle offered for sale written notice of any material mechanical defect in the motor vehicle and any damage sustained by the motor vehicle because of fire, water, collision, or other causes for which the cost of repairs exceeded one thousand dollars ($1,000), when the defect or damage was known to the dealer.
The notice required by § 1421.1 shall be included on the car order and bill of sale and shall state the specific defect or damage known to the dealer in a type size equal to the largest type size that appears on the car order and bill of sale.
Each motor vehicle dealer shall display on the windshield of each used motor vehicle offered for sale, a sign with all upper case letters no less than three inches high (3" H.), with the appropriate blank checked, that says:
This motor vehicle has________________________________ or has not
_____________been inspected to determine if defects exist.
D.C. Mun. Regs. tit. 16, r. 16-1421