Ever have any cases of Doping in the Dojo?

Anyone ever caught a student or fellow student who was on any kind of drug be it performance enhancing or otherwise and if so how did you deal with the situation, did you try talking to them about it or shrug it off as them just being stupid and ruining their own body with that garbage, btw this is directed at everyone not just Combat Sport enthusiasts because it's not that unlikely that someone who has taken up martial arts for self defense wouldn't want a fast track to strength out of fear and paranoia, people do really stupid things when they're scared like that,I'm not looking down on anyone and I'm not sullying the name of martial arts with this either ,so yeah anyway just want to know if anyone ever has come across any situations like this