CNN Erin Burnett OutFront May 1, 2013 03:16:00
For years. >> at the end of the day, it's very difficult because with many of these individuals, we don't know when they're going to cross the line from rhetoric to violent action. >> security experts argue watch lists can still be valuable to investigators, tracking terror networks after an attack. but the fact the boston bombings were the work of someone already on a list is now in itself being looked at very hard. for "outfront," tom foreman, washington. >> "outfront" tonight, a former cia analyst who spearheaded the -- operations team. seth jones is the associate director of the internatio...