The department shall:
(1) enforce all laws pertaining to children and take the initiative in all matters involving the interest of abused or neglected children;
(2) use funds allocated or appropriated to the department for the purpose of providing for the special medical or material needs of children with developmental disabilities or children with physical disabilities who are eligible for department programs;
(3) cooperate for the purposes of this part with all reputable child-helping and child-placing agencies; and
(4) inspect and register or license youth care facilities, child-placing agencies, and adoption agencies.