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Attempting to send harmful matter. there is another potential predator who has a history with perverted justice. he doesn't want to come to our house either so our decoy is now waiting for him in the park. so are "dateline's" cameras. he is 48-year-old frank sierras. back in 2004, before "dateline" was working with perverted justice, sierras using the name pitbulldavid2001 chatted online a decoy who said she was 13. he sent pictures of his penis and told her, i want to make love to you. i know i will say i love you when i am making love to you. >> back then, perverted justice put its chat on t...

Sir. >> all right. if you're not feeling well, perhaps you should just go. >> no, sir, i'm okay. just i feel bad about myself. >> before you leave, there's one thing that i need to tell you. i'm chris hansen of "dateline nbc" and we're doing a story on computer predators. if there is anything else you would like to say, we'd like to hear it. if not, you're free to leave.

Images, these images of you, your genitals to a 13-year-old girl. >> i never meant any harm at this point, sir. >> you would have had sex with this girl if the opportunity arose? >> no. i probably wouldn't because -- no. i was thinking on the way here i'd maybe -- i just need to talk, you know. >> well, you were talking online here. >> yeah. >> you tell her that you'll teach her various sex acts. >> you. i'm -- i'm sorry. >> why would you risk so much for this one time encounter? >> i don't even understand it myself, sir. >> do you ever watch "dateline nbc"? does this all seem a little familia...

About what you want to do with this boy sexually. >> because that's what he wanted and told me. >> so it's his fault? >> not really. no. i'm taking full blame for whatever happened. >> and although he seems to take full blame, he insists he didn't believe the boy, kevin, was really 13. was there a conversation about you look so much older? >> no. but i did tell him that i think something does not seem right. >> you also gave him a laundry list of sexual acts that you wanted to engage with him in. >> now you gonna tell me who you are now? >> yes. i'm chris hansen with "dateline nbc" and we're d...

There are a lot of sexual predators out there. predators. >> am i one? >> are you? you know, it's against the law. >> oh. >> oh? >> yeah, yeah. no, no. i mean, it's bad. >> it's time to wrap up this interview and make room for our next visitor. >> well, there's something i gotta tell you. i'm chris hansen with "dateline nbc." >> [ bleep ]. cover my face. >> we asked him to go in the house and out the front door so this next man can come in through the garage. as our new arrival makes his way into the backyard, police arrest the first man in the front. the police are so quiet that this 33-year-...