>> using code words like roses or diamonds, photos show men just what they're buying for their time. >> with help from a federal human trafficking grant the oakland pd along with the fbi regularly conducts sting operations. >> oakland police. open the door so we don't have to use the key. >> on this night after officers spotted a pimp with two suspected minors, they entered his hotel room and find a pregnant teen selling herself. 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.