D.C. Code § 50-921.11
Section 4 of D.C. Law 17-284 provided that sections 2 and 3 shall apply as of July 1, 2008.
Section 629 of D.C. Law 18-370 provided: "Sec. 629. Applicability. This subtitle shall apply as of October 1, 2011; except, that sections 622 and 623(a)(2) shall apply as of the effective date of this act."