D.C. Mun. Regs. tit. 24, r. 24-616
At the time of the acceptance of the motor vehicle for valet parking, the licensee shall supply a claim check or receipt to the person leaving the vehicle for valet parking.
Each claim check or receipt shall be distinctly numbered to correspond with a coupon that shall be placed upon the motor vehicle's dashboard during the time the vehicle is valet parked.
Each claim check or receipt shall show, on its face, the personal or business name of the licensee.
For each vehicle that has been valet parked by the licensee, the licensee shall store the keys of that vehicle in a secure manner and location.
No motor vehicle shall be parked or caused to be parked so that it is parked in a public space not zoned for the parking of motor vehicles, or in a manner proscribed by the District Department of Transportation in Title 24, Chapter 16 of the District of Columbia Municipal Regulations.
D.C. Mun. Regs. tit. 24, r. 24-616