to isis to plan future attacks. >>. if he is on the ground in syria, which you say is hard to believe or on his way there, because many made it by foot or boat, how does u.s. intelligence find him? because this has been the issue in syria in fighting isis. we don't have eyes on the ground. >> so then we use our traditional technology advantages, which is the technology. what did we do? we have cell phones and other tracking methods. occasionally we have informants, but generally it's the old fashioned wait until the person makes a mistake and mostly its through his communications and we go through that. if he hasn't made it back to isis, there's a good chance he's smart to enough to hold up in a safe house location where someone is bringing him food. not too many people know about so he's waiting and may have to wait for months in a a single bedroom apartment. >> all you need is one person to crack like this friend coming to