security analysts say anwar al alawki. ka limb sheikh mohamed is believed to have used a hotmail account. >> al qaeda started with one a decade ago. we have at least a dozen al qaeda web forums that host thousands of individuals. >> reporter: a few years back when the hunt for osama bin laden was still raging, some intelligence forces believed al qaeda was even developing its own intranet that was electronically hidden behind jihadi websites and accessible to only a few people. whether they succeeded or such a system still exists like much of the communication structure remains shrouded in mystery. tom foreman, washington. >> of course the great irony using so much american innovation to try to destroy america. "outfront" next why dr. sanjay gupta change ed his mind on weed. an about-face and he h eel explain why. >>> then are you driving a compact car that failed a crash test? we have the alarming results. >>> and a double play. he made the catch but what he did next was the true score. [ male announcer ] these days, a sma

security analysts say anwar al alawki exchanged e-mails with nadal hasan. shaikh mohammed is believed to have used a hotmail account. >> al qaeda started with one a decade ago. we have at least a dozen al qaeda web forums that host thousands of individuals. >> reporter: a few years back when the hunt for osama bin laden was still raging, some intelligence forces believed al qaeda was even developing its own intranet that was electronically hidden behind jihadi websites and accessible to only a few people. whether they succeeded or such a system still exists like much of the communication structure remains shrouded in mystery. tom foreman, washington. >> of course the great irony using so much american innovation to try to destroy america. >>> our tourt fourth story outfront, dr. sanjay gupta changes his mind on weed. 20 states allow medical marijuana. and the medical community seems to be changing its mind on pot. but you know, not everybody is. a lot are adamantly against it. but there is a dramatic turn around for dr. gupta who just four years ago wrote a

citizen actually who's ever been assassinated, if that's the word, having been on the kill list was anwar al alawkiarized online and convinced some susceptible, not very bright, perhaps, young muslims to convert. >> how did he do that? >> well, how does anybody do anything? there was a guy once who brainwashed an entire nation. if you can do that to a nation, you can certainly do it to a few stupid boys. that's what he did. so this story is about the success successor, because he's dead. he was killed, i think, two years ago by a drone in north yemen. this suggests a successor who also preaches online. it's not so much would it be possible, it's how do -- how does the american counterterrorist machine hunt down these terrorists one after the other. they've taken out just about the entire cream of al qaeda, the leadership, one after the other. they've been killed mainly by drones. of course, the biggest of all was a personal visit to osama bin laden. >> i've heard of him once or twice. part of the interest in a book like this, other than it bag great read, is the sort of fear and fascination with te