D.C. Mun. Regs. tit. 30, § 927
927.1 If a player validates a winning KENO Ticket and a portion of the KENO Ticket has draw(s) remaining, a KENO Exchange Ticket will be reissued to the player at no additional cost. A KENO Exchange Ticket shall contain the exact KENO Game Play and future drawing date(s) appearing on the validated KENO Ticket it is replacing and shall have all other characteristics of a KENO Ticket except as otherwise stated in these rules. An Exchange Ticket shall not contain a Ticket price.
927.2 KENO Exchange Tickets are valid beginning with the next draw through the last draw on the original KENO Ticket.
SOURCE: Final Rulemaking published at 50 DCR 1520 (February 14, 2003).