(a) an existing child custody determination;
(b) a request to do so from a court in a pending child custody proceeding;
(c) a reasonable belief that a criminal statute has been violated; or
(d) a reasonable belief that the child has been wrongfully removed or retained in violation of the Hague Convention on the Civil Aspects of International Child Abduction. 2. A prosecutor or appropriate public official acting under this section acts on behalf of the state or local government entity and may not represent any private party.