ELECTRIC DAISY CARNIVAL INVADING LAS VEGAS AFTER RECENT PROBLEMS

It's easy for Richard Brian to tell who's on "it."

The Las Vegas resident has been at enough raves -- dances dominated by electronic music and pulsating lights -- to know. He doesn't even use the drug's name. "It" suffices.

"I'm not saying everybody's on it, but definitely a lot of them are," said the 29-year-old photographer, describing the crowd of 185,000 crammed into Los Angeles Memorial Coliseum last year for the country's largest rave, Electric Daisy Carnival. "It's just a part of it."