When appropriate and subject to available funds, the treatment and training of a person with a developmental disability who is committed to the custody of the department of social and health services or to a facility licensed or certified for ninety day treatment by the department for a further period of intensive treatment under RCW
71.05.320 must be provided in a program specifically reserved for the treatment and training of persons with developmental disabilities. A person so committed shall receive habilitation services pursuant to an individualized service plan specifically developed to treat the behavior which was the subject of the criminal proceedings. The treatment program shall be administered by developmental disabilities professionals and others trained specifically in the needs of persons with developmental disabilities. The department of social and health services may limit admissions to this specialized program in order to ensure that expenditures for services do not exceed amounts appropriated by the legislature and allocated by the department of social and health services for such services. The department of social and health services may establish admission priorities in the event that the number of eligible persons exceeds the limits set by the department of social and health services.