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And so we are not going to take, you know, any chances in missing something, so absolutely, we're going to investigate every possible lead. >> have any clues been leaked from that process so far? >> i can't speak directly to any leads or pieces of evidence we've been able to uncover at this point. >> any additional information about dimaggio's outdoor experience or the level of expertise he has? >> i don't. i have heard the same thing that you have, that he's a survivalist or where that comes from or what kind of experience he may have with camping or that kind of backcountry area. >> you stil...

They basically spend a lot of times on these sites and monitor their travel pattern and their communications. put them together and create a kind of a profile. >> needed to do almost the impossible. sort out the radical muslims not prone to violence and those that could turn into terrorists. >> it's a very difficult thing to detect when an individual's motive are people are self radicalizing. that keep step to then make the decision that i'm going to act on this and i'm going to act violently on this.

Promote islamic extremism. they basically spend a lot of times on these sites and monitor their travel pattern and their communications. put them together and create a kind of a profile. >> needed to do almost the impossible. sort out the radical muslims not prone to violence and those that could turn into terrorists. >> it's a very difficult thing to detect when an individual's motive are people are self radicalizing. that keep step to then make the

Communications. let's actually start putting this travel pattern, putting their cyber footprint pattern and put them together. and create kind of a profile. a threat profile about that specific individual. >> law enforcement would need to do the almost impossible, sort out who are the radical muslims, not prone to violence and those who could turn into terrorists. robert grenier a former cia counterterrorism chief. >> it's a very difficult thing to detect when an individual, small group of people are self-radicalizing. that key step to go from views that you and i may consider to be radical or...

Description for threating about the boston kind of threat. even there we recognized that we have to be very careful, very selective. this couldn't be this broad net over all of america's conversations. even there, it was very, very targeted. >> i asked ali sufron, a former cia special agent. a publication of sorts on the web which contained the information of how to build these pressure cooker bombs. should the united states government be trying to shut down these kind of websites and is it feeasible? >> i don't think it's the issue of feasibility. you know, it's very hard to regulate the inte...