“It was among the greatest single days of loss in CIA history. On December 30, 2009, a suicide bomber detonated on a base in eastern Afghanistan, killing seven CIA officers and Blackwater contractors who thought he would take them to al Qaeda’s leadership.
Now, the agency has determined what went wrong: it didn’t check out the killer thoroughly enough to determine his true loyalty.”
http://www.wired.com/dangerroom/2010/10/cia-didnt-vet-double-crossing-suicide-bomber/#ixzz132ras0j9