Amends the Missing Children's Assistance Act to include within the definition of "missing child" a child (less than 18 years of age) whose whereabouts are known to the child's legal custodian from whose control such child: (1) was removed in violation of law; or (2) is believed by such custodian to have been taken out of the Untied States without the consent of such custodian by, or for the benefit of, an individual who may possibly claim custodial rights with respect to such child.