D.C. Mun. Regs. r. 16-332
No person shall execute on behalf of any dealer, and no dealer shall permit any person to execute for or on behalf of that dealer, any invoice or retail installment contract, unless prior to that signing the dealer has in writing designated that person as the dealer's authorized representative for that purpose and has filed the designation with the Director.
No dealer shall cause or permit any instrument of security covering the sale or assignment or a motor vehicle by that dealer to be signed by a purchaser in blank.
No dealer shall cause or permit any instrument of security covering the sale or assignment or a motor vehicle by that dealer to be signed by a purchaser prior to the time all information required by this chapter has been completed in the body of the instrument of security by the dealer and certified by the dealer to be correct.
No dealer shall cause or permit any instrument of security covering the sale or assignment or a motor vehicle by that dealer to be signed by a purchaser before the dealer has exhibited to the purchaser the completed instrument of security and given the purchaser reasonable opportunity to examine the instrument of security and to inform himself or herself of the contents of that document.
D.C. Mun. Regs. r. 16-332