D.C. Mun. Regs. tit. 25-A, § 3713
3713.1 A food vendor shall conspicuously display on the vending vehicle, vending cart, or vending stand, a valid:P
(a) Food Vending Business License;
(b) Vending Site Permit;
(c) Department of Consumer and Regulatory Affairs (DCRA)-Issued Vendor Identification Card;
(d) Propane permit issued by the Fire Prevention Division of the Fire and Emergency Medical Services Department, for use of propane;
(e) Food Protection Manager Certificate;
(f) Department-Issued Certified Food Protection Manager Identification Card;
(g) Health Inspection Certificate; and
(h) Motor Vehicle Registration.
3713.2 The items enumerated in § 3713.1 shall be considered to be properly displayed when they are firmly attached to the vending vehicle or stand and made clearly visible to the public.
3713.3 A food vendor or employee of a food vendor shall surrender all applicable licenses, permits, and certificates for examination upon demand by any authorized representative of the Department.
3713.4 No person shall alter, mutilate, forge, or illegally display any license, permit, or other certification issued by the Mayor pursuant to this Code.
SOURCE: Final Rulemaking published at 50 DCR 4394 (June 6, 2003); as amended by Final Rulemaking published at 59 DCR 13690 (November 30, 2012).