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Several prior charges. >> coulson, he had four prior charges from theft to simple battery, simple assault. some of these are aggravated-type crimes. >> but he was never convicted. tonight he will have four more charges added to the list. enticing a child for indecent purposes, obscene internet contact, criminal attempted child molestation and possession of marijuana. one charge was dropped. scoobydoo is brought into the interrogation room. >> oh, my god. i just want to start crying but i can't cry. >> investigators read coulson his rights. >> i have to advise you that you have the right to rem...

Now these suspects are under arrest and heading into a police interrogation room. again, some of what you see and hear is explicit. here's chris hansen. >> it was stupid. i'm a stupid man. >> after "dateline" confronts a potential sex offender here in rural fortson, georgia -- >> you're free to leave. >> what's going to happen? >> get on the ground! >> law enforcement working with the online watchdog group perverted-justice steps in. >> put your hands behind your back. >> even the u.s. marshal and secret service are involved. remember scooby-doo atl-01? 23-year-old denis coulson? he made plans...

He's driven a long way for this meeting. almost two hours. >> there he is. there he is. >> but the driver won't find a young girl inside. instead a "dateline" investigative team awaits his arrival. >> he's coming in. >> why is this man making such a long trip in the dead of night? perhaps because he believes a 15-year-old girl is alone inside, ready to have sex with him. >> open the door and call him. he's coming. >> but his journey didn't begin today. it began more than a week earlier when he entered a yahoo! georgia chatroom and decided to hit on a decoy, an adult posing as a 15-year-old. it...

>> let's just not talk about it. >> turns out scoobydoo had several prior charges. >> coulson, he had four prior charges from theft to simple battery, simple assault. some of these are aggravated-type crimes. >> but he was never convicted. tonight he will have four more charges added to the list. enticing a child for indecent purposes, obscene internet contact, criminal attempted child molestation and possession of marijuana. one charge was dropped. scoobydoo is brought into the interrogation room. >> oh, my god. i just want to start crying but i can't cry. >> investigators read coulson his ri...

Is a member of perverted-justice, the online watchdog group dedicated to catching internet sex predators. >> it's just a matter of getting them in the door. >> "dateline" paid perverted-justice a consultant's fee to do what it usually does, go into chat rooms posing as 13-year-olds to 15-year-olds home alone interested in sex. some decoys pretend to be eager about sex. that's because experts we have spoken to say young teens are often curious, even precocious, when it comes to chatting online about sex without knowing the potential life-long repercussions of being molested by an adult. >> i do...