The director or the superintendent or official in charge of any facility, on having his or her reasons noted on the client’s record, may discharge any client:
(1) Who, in his or her judgment, is substantially improved.
(2) Who, in his or her opinion, is not developmentally disabled.
(3) Who is not substantially improved but whose discharge, in his or her judgment, will not be detrimental to the public welfare or injurious to the client.