D.C. Mun. Regs. tit. 16, r. 16-109
No person covered by this chapter shall cause or permit any contract or other document relating to a retail installment transaction to be signed by the buyer before all blank spaces (other than signature spaces) are filled in with easily legible writing and such seller has submitted to the buyer the completed contract or other document and given the buyer a reasonable opportunity to examine it.
Each contract shall contain a notice, satisfactory to the Department stating in substance that the buyer shall not sign the contract in blank and that the buyer is entitled to a readable copy of the contract at the time he or she signs it. The notice required by this subsection shall be printed in bold type not smaller than ten point (10 pt.).
D.C. Mun. Regs. tit. 16, r. 16-109