D.C. Mun. Regs. tit. 23, § 905
905.1 The admittance requirement of those persons displaying a valid identification as set forth in D.C. Official Code § 25-782(d) shall not preclude establishments from enforcing a dress code or an age restriction, provided those establishments do not discriminate on any basis prohibited by Chapter 14 of Title 2 of the D.C. Official Code.
SOURCE: Final Rulemaking published at 55 DCR 12991 (December 26, 2008); as amended by Final Rulemaking published at 66 DCR 1822 (February 8, 2019).