D.C. Code § 50-1612
(a) As of June 1, 2008, a person regularly engaged in the business of renting bicycles shall require each person seeking to rent a bicycle to provide his or her signature on the rental form, or on a separate form, containing each of the following:
Mar. 16, 1985, D.C. Law 5-179, § 202
as added May 1, 2008, D.C. Law 17-149, § 2(c), 55 DCR 1272