devices carry big risks. there are reports that clementi's roommate may have turned on his web cam remotely from another room to record him. he had no idea his encounter was being streamed to the internet. you don't even have to own the web cam to use it to spy. hackers can access other people's web cams. they can live stream and record victims without their knowledge. it can go on for days and months. is there a defense to this? cyber security expert gregory evans explains how this works. >> i want to make sure people understand this. just because you have a camera on your computer doesn't mean somebody could just turn on your camera just like that. they have to know exactly what they're doing. so what we're going to do is we're going to use a program like, let's say, netasploit, which is a hacking program. it's the most usable program out there in the world when it comes to computer hacking. you can download it on the internet for free. we'll use that and hack into one of our test networks, and then