You've said that back then you knew how well a set was going by how hot the room was. What are you indicators these days? 

It's the same. I make them turn the fans in the DJ booths off. If it's hot, people are dancing. If it cools off, they've either stopped or they've left. It's physics. 

So you think some DJs are getting away with murder? 

Oh god, yes. That's an understatement.