Jeffrey toobin. how significant is it that female dna has been found on one of the bomb fragments? >> well, the significance for me is the fbi is clearly looking for accomplices. they haven't closed this investigation by any means. they think there's a good chance out there that somebody helped at some stage, whether it's a bomb maker, to put this thing together, so they're very much on this and they're following every lead, but the circle seems to be still very wide. >> you think at the end of the day that the bomb itself, the devices themselves, will be the biggest keys in figuring out if th...