In an interview with Mohan "Launders" Govindasamy, pro Counter-Strike player Kory "SEMPHIS" Friesen was asked whether "everyone does Adderall" at certain esports events. "Yeah", was the answer.
"I don't even care," Friesen tells Govindasamy, referencing the comms that day. "We were all on Adderall. I don't even give a fuck. It was pretty obvious if you listened to the comms. People can hate it or whatever."
Adderall, normally prescribed to treat ADHD, can help players focus. Practically, Friesen's public admission isn't surprising: esports is a career and has money in it, so just like regular sports, there will be those willing to take some drugs in order to increase their performance. It's only surprising that he admitted it in the first place, since it's not something that's spoken of very often.
For what it's worth, the ESL's rules on drug use are as follows:
To play a match, be it online or offline, under the influence of any drugs, alcohol, or other performance enhancers is strictly prohibited, and may be punished with exclusion from the ESL One.
You can watch the full interview below.