. >> kroft: and there is adam gadahn, a muslim convert who left his jewish grandfather and his parents' goat farm in california a decade ago to become a spokesman and senior operative for al qaeda. he is now a fugitive who is wanted for treason. >> adam gadahn: i will now destroy my american passport. >> kroft: that clip has also been all over the internet, along with the fiery preachings of anwar al al-awlaki, an influential american cleric now living in yemen, who has been linked not only to the underwear bomber, but to army major nidal hasan, who is charged with killing 13 fellow soldiers at ft. hood, texas. >> kelly: you can get these radical web sites that... and these people will refer to them when they're... when they're taking into custody. and they'll talk about these web sites. we monitor these web sites, quite frankly. we monitor them with our own people who have, you know, language skills, that... we've been able to use and... and build on. >> phillip mudd: what we're facing here is not an episodic series of terrorist events. what we're facing is a group of people who see t

they got people like adam gadahn, an anwar al awlaki, these guys can have a tremendous impact, and havet caught if they have clean scans, no reason to trigger the law enforcement system. it makes it much more difficult. what you do need, community policing. local police departments and involved citizens like we saw in the vendor is the sort of court of last resort who can catch them. >> jack, does it scare you, i guess, more or less that as jeanne meserve was explaining to us, that he didn't have any associates working with him inside the u.s.? >> both. it's better in the sense that this may not be a very large, very elaborate and california very extensive operation which could kill a lot of people. that's a positive. the negative for the very same operation is it's very difficult. if you have a lone wolf who's absolutely clean, how do you track that guy? do you simply say, okay, it's anybody who's a naturalized citizen? how many of those do we have? do you narrow it down from there and how do you narrow this down? every time you make a mistake and go after people you shouldn't, you cre