Unless otherwise specified in a collective agreement between an employer and a bona fide union representing his employees:
D.C. Code § 32-1303
Applicability of D.C. Law 20-61: Section 11001 of D.C. Law 20-61 provided that, except as otherwise provided, the act shall apply as of October 1, 2013.
Applicability of D.C. Law 20-157: Section 7 of D.C. Law 20-157 provided that the act shall apply as of October 1, 2014, and that the act shall apply to violations occurring after October 1, 2014.