today on the streets of cities big and small all across america, the fbi estimates that one in five of those picked up for prostitution is an underage child. >> most people when they hear human trafficking, they think of it as purely an international issue. you know, that doesn't happen here. >> illinois state's attorney anita alvarez is lead prosecutor for the cook county human trafficking task force. >> and i think the public, we need to be more aware of yes, it does happen here, it is happening in our own back yard. >> increasingly, the business of sex for sale is moving off street corners like the track in oakland and onto the internet.