At the request of Reps. Waxman and Dingell, the General Accounting Office (GAO) investigated the extent to which children in Medicaid are receiving important health screening and other preventive services. In July 2001, GAO reported that many children are not receiving the services required by law and that managed care plans participating in Medicaid do a poor job of providing data to states and the federal government about the provision of these required services.