Subject to Chapters 50 and 51 of this title, no person shall be involuntarily admitted or committed to or confined as a patient at a residential treatment facility, and such facilities, other than general hospitals, shall not admit or confine as an involuntary patient any person, unless:
(1) Such person is determined to be a person in need of treatment in accordance with the procedures of this chapter; and
(2) Said treatment facility has been specifically designated as an appropriate facility for the treatment of involuntary adult patients by the Secretary of Health and Social Services and by the Department of Services for Children, Youth and Their Families for the treatment of involuntary minor patients.