Courts have ruled the U.S. has no cause to hold them. Or they've been vetted by the current administration. By whatever measure that's used, 560 Guantanamo Bay Detention Center detainees have been released as the administration keeps moving forward toward a goal of closing the center.
A report indicates that one-in-five of those released have engaged in terrorism after their release.
A Pentagon spokesman says determining who ought to be released is an "inexact science." The administration has suspended releasing detainees from Yemen due to the recent attempt to blow up a Northwest Airlines flight on orders from al Qaeda in Yemen.