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>> ronnell, do you ever watch television? >> uh-huh. >> do you ever watch "dateline nbc"? >> yeah, and i've seen this on tv before. >> you've seen this on tv before? >> i pretty much knew it was going to happen. >> what made you think that this was going to happen? >> for one, which i think is kind of -- i think it really, you know, is kind of like misleading in a way, but from what i just knew, i could tell because of how she just kept trying to see if i was really going to come. >> so you smelled a rat? >> yeah. >> but you came anyway? >> yeah. >> why? >> something i did. >> something you di...

I've got to finish brushing my teeth. >> you're alone? >> come on in. i just have to finish brushing my teeth. just hang out at the counter for a second, okay? >> many of these guys have an instant change in terms of the look on their face once i walk into the room. you see them come in. they're chatty. some are nervous. some are more comfortable. but as they have this dialogue with this decoy, they're starting to think that their dream date is going to come to fruition. and then i walk out. >> why don't you have a seat for me, please, on that stool? >> and at this point, some of these guys st...

>> well, let me correct you a little bit on how the law works. because it's against the law to try to solicit sex from somebody who's underage on the internet. >> i didn't know that. i had no clue. >> i mean, come on. >> you can converse. right? that's no problem. >> why talk to somebody who's only 12 or 13 years old, though? why not talk to somebody your own age? >> can i just -- >> sure. you want some water? you got some. >> i think it's nervous reaction. you know? they don't know what to do. a lot of guys will pick up the chip and eat it or the cookie or the brownie or take a sip of water. ...

>> can you tell me who you are? >> i'm chris hansen with "dateline nbc" and we're doing a story on computer predators. and if there's anything else you would like to say, we'd like to hear it. you never get used to seeing a teacher surface in one of these investigations, but the very first time, i was just shaking my head. it's like, how could somebody involved in educating kids, in this was special education, even a screenname, crazy for the nats, the nationals, the baseball team, would indicate that he's just a regular guy. teacher taking the summer off, 50-something years old, going to base...

>> i don't understand why i can't -- >> i'm more than happy to tell you who i am. i'm chris hansen with "dateline nbc" and we're doing an investigation. you don't want to touch anybody. you don't want to -- >> it was really only one of the times -- the only time, really, when someone physically lunged at me. i don't think i was in much danger but you can see how the security works. our guy stepped in. took care of it. and diffused the situation. >> you got to stop this. >> sit down. sit down. >> you're free to leave any time. >> we got phone calls from him. for months. and he was down right me...