The law has helped authorities prevent terrorist plots , says a senator . But `` It 's something with enormous potential for abuse , '' says a member of Cato Institute . Score: 6 Opponents say Americans communicating with persons abroad still could be spied on .
The law has helped authorities prevent terrorist plots , says a senator . But `` It 's something with enormous potential for abuse , '' says a member of Cato Institute . The law , passed in 2008 , requires officials to obtain a warrant to spy on any American . Opponents say Americans communicating with persons abroad still could be spied on .