It is the intent of the General Assembly that public agencies that serve children, youth, and families in the State exchange information with the written consent of the person in interest or another individual authorized to give consent under this subtitle. The exchange of information under subsection (a) of this section is for the purpose of: carrying out the policy established under § 8-102 of this article for children, youth, and family services; facilitating the development of a seamless system of family-focused services; and achieving a comprehensive and coordinated interagency approach to providing a continuum of care that is family- and child-oriented.