"It was a group of about 12 people at someone's house and we were all just celebrating," Anna recalled. "Somebody had it and, and you know, it was a pretty electronic music kind of crowd." 

Molly, an illegal stimulant frequently sold in pill form, has become prominent in the electronic music scene over the past decade, said Anna, 26, who did not want to give her full name because she is in school and "counseling people to be healthy." 

Molly is the street name for a drug that is pushed as the pure powder form of a banned substance known as MDMA, the main chemical in ecstasy.