Every single one of Lauda's trust ratings are public, and hes spot on with his ratings most of the time. I doubt they'll be any evidence provided by your source and once the source can't show any evidence to back up the claims should probably come under investigation themselves after trying to slander someones name with malicious intent.
Anyway, drug use/addiction is a personal issue and depending on the severity and other circumstances should be helped rather than ridiculed.