In the end you know they did heroin, when he's throwing up all over the side of the car yelling at the people driving next to them and spitting alcohol at them. If you listen to what he says, he says he did pure heroin. I may be wrong on that one though. Yea they did ether too lol. That part was hilarious just because they let him in the casino when he was all messed up like that. The way they were walking had me cracking up.