Vince did get busted for distributing to his employees several years ago; probably wouldn't be hard to dig up an old article for anyone who cared to read into it. It seems pretty obvious that it didn't slow him or anyone else down, however.
I thought he was aquitted of all charges? If I recall, They tried to get him, but the trial made it clear that he did NOT distribute steriods to his wrestlers. I think he admitted to encouraging them to use them, but that is totally different than selling them or handing them out.