>> using coy code words, like roses or diamonds, these ads so men just what they're buying. >> this is a craigslist operation. >> with help from a human trafficking grant, the oakland pd and fbi conduct internet sting operations. >> police, open the door. >> on this night, after officers spotted a pimp with two suspected minors, they entered a hotel room and find a pregnant 17-year-old selling herself and the minors on the internet. during questioning, the pregnant teen admits to posting craigslist ads for her pimp while the other minors walk for cash. >> were they supposed to work tonight? >> though she's been beaten and hospitalized multiple times, the girl who has been sold online since she was 15 says it's tough to escape. farley says the internet makes exploiting teens easy money.