** FILE ** Nassau County police escort Peter Troy into police headquarters in Mineola, N.Y. in this Tuesday, March, 13, 2002 file photo. Troy is accused of shooting a priest and a parishioner at Our Lady of Peace church in Lynbrook, N.Y. People with a history of mental illness are banned by federal law from purchasing guns. Licensed gun dealers are to check a database before making sales, but most states have privacy laws barring such information from being shared with law enforcement. Legislation pending in Congress that has bipartisan support seeks to get more of the disqualifying records in the database. (AP Photo/Ed Betz, FILE)