. >> coming up, the dark underside of america's domestic oil boom. we do have the best justice system in the world, in theory... the problem is, it's run by human beings... human beings make mistakes... i'd like to think of this show as a watch dog about the system... to make sure justice is being served. wrongful convictions happen, we need to be vigilant. with our personal liberties taken away from us, it better be done the right way. is justice really for all? >> there's an energy revolution going on in america's heart land. crude oil is flowing from the planes of north dakota at a record rate thanks to frack bei. that is bringing big problems to america's boom towns. christof putzel, sex trafficking on the prairie. >> how did this look when you were first mayor? >> i wouldn't say dead, but probably dying. >> the sign says it all, williston, north dakota. the mayor has seen it come back from near death. >> it's amazing what oil can do for you, black gold. >> reporter: the race to extract that black gold from the prairies of north dakota is evident

. >> coming up, the dark underside of america's domestic oil boom. >> i'm joe berlinger this is the system people want to believe that the justice system works. people wanna believe that prosecutors and police do the right thing. i think every american needs to be concerned about that. we do have the best justice system in the world, in theory... the problem is, it's run by human beings... human beings make mistakes... i'd like to think of this show as a watch dog about the system... to make sure justice is being served. wrongful convictions happen, we need to be vigilant. with our personal liberties taken away from us, it better be done the right way. is justice really for all? families ripped apart... >> racial profiling >> sometimes they ask questions... sometimes they just handcuff people... >> deporting dreams... destroying lives... >> this state is literally redefining what it means to be a criminal alien fault lines al jazeera america's hard hitting... >> they're locking the doors... >> ground breaking... >> we have to get out of here... >> truth seeking... award winning investigati

. >> that's the dark underside of this constituency. people respond anonymously and can do so instantaneously from anywhere around the country or the world. that anonymity feeds -- you see it in all forms of communication within the internet, but it feeds dark responses, the veiled threats and frankly the express threats that your guest last night talked about that he received. he's a gun guy through and through. most gun owners really don't operate that way, don't respond that way. but there is enough of a really dark base that has been fed a steady diet of paranoia and apocalyptic rhetoric that all the nra has to do is hit a switch and they are unleashed. >> thanks for your time. >> good to be with you. >> coming up, what do the koch brothers have against jack hannah and his animals? you do your shop from anywhere thing, and we'll be here at lifelock doing our thing: offering protection that simple credit score monitoring can't. get lifelock protection and live life free. (agent) i'll walk you guys through every step. there are a lot o

dark underside. >> daytona attracts a lot of transient people, and so along with the people that want to come hereaytona, we also have the criminal element that wants to come, also, and prey on the visitors that come here. but it's not just the visitors here who fall victim to crime. >> i'm working alone here in the store and it was 3:00. everything is fine. >> an immigrant from bangladesh moves his family from new york to daytona beach to get away from the cold. but the sun and surf are no protection against what happens on that beautiful summer day at the valero gas station and convenience store. >> i was fixing the newspaper and one guy opened the door and came right behind me and put knife here. >> udon can't believe what is happening to him. he fights back, but the knife wielding robber quickly gains the upper hand and threatens udon. >> told me, don't talk, don't move. if you move, i will cut your throat. >> holding him at knife point, the thief orders him to go behind the counter and open the cash register. the clerk tries to comply, but is so terrified that he can't do it. >> i don't know.