This enhancement issue is going to get more interesting.
One question I have on this festering issue is whether rules and/or laws were broken in the alleged use of these substances by the parties mentioned. If neither a law or a league rule was broken, should records be questioned, players blacklisted, etc.? I have been led to believe that if something isn't illegal then its use is legal and you should not be penalized for using it.
I look forward to the info you describe to get a better understanding of this issue.