D.C. Mun. Regs. tit. 27, § 1506
1506.1 The IFB shall state when the bidder is required to furnish samples.
1506.2 The contracting officer shall not require bidders to furnish bid samples unless there are characteristics of the product that cannot be described adequately in the specifications or purchase description.
1506.3 Bid samples shall be used only to determine the responsiveness of the bid and shall not be used to determine a bidder's ability to produce the required items.
1506.4 The contracting officer shall reject a bid as nonresponsive if the sample fails to conform to each of the characteristics listed in the IFB.
SOURCE: Final Rulemaking published at 35 DCR 1423 (February 26, 1988).