Section 7-1141.02 - Establishment of the Department of Behavioral Health(a) There is established as a separate, cabinet-level Department, subordinate to the Mayor, the Department of Behavioral Health.(b) The Department shall be the successor-in-interest to the Department of Mental Health, established by Chapter 11A of this title [§ 7-1131.01 et seq.], and the Department of Health Addiction Prevention and Recovery Administration, established in the Department of Health by the Reorganization Plan No. 4 of 1996, effective July 17, 1996 [§ 1-1514.01 ].Dec. 24, 2013, D.C. Law 20-61, § 5113, 60 DCR 12472.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.