The purpose of this subtitle is to protect children who have been the subject of abuse or neglect by: mandating the reporting of any suspected abuse or neglect; giving immunity to any individual who reports, in good faith, a suspected incident of abuse or neglect; requiring prompt investigation of each reported suspected incident of abuse or neglect; causing immediate, cooperative efforts by the responsible agencies on behalf of children who have been the subject of reports of abuse or neglect; and requiring each local department to give the appropriate service in the best interest of the abused or neglected child.