keith morrison: but, if livers was looking to clear himself of suspicion by taking that test, it did not quite have the desired effect. your subconscious body is telling the machine. you cannot fool it. i didn't have anything to do with this. you did. - i did not. - you did. - i did not, bill. - you did. i did not. i'm sorry, you did. keith morrison: for more hours, the detectives locked horns with livers. and despite his continued denials of involvement, they knew they said, he was lying. we've had so many people sitting in that chair, ok, they think that they're smarter than us, and they're not. - no. - ok. i'm dumb as a brick. no you're not dumb as a brick, ok? you made a mistake. you [bleep] up. you did. you [bleep] and now you're going to pay for it. why were investigators here in nebraska so convinced matt livers was lying? well, besides the polygraph, that was the state profiler who suggested that this is a sort of crime committed by young males who know their victims. how else would they know to find the farmhouse way out in the middle of nowhere, if they didn't know them?