(a) The executive commissioner shall provide for joint training for health and human services caseworkers whose clients are children, including caseworkers employed by:
(1) the commission;
(2) the Department of State Health Services;
(3) a local mental health authority; and
(4) a local intellectual and developmental disability authority.
(b) The joint training must be designed to increase a caseworker's knowledge and awareness of the services available to children at each health and human services agency or local mental health or intellectual and developmental disability authority, including long-term care programs and services available under a Section 1915(c) waiver program.