Geez, nothing good comes from this. Three points from me.
Firstly, if a player "is on" cocaine or MDMA when training or playing, then this may not be performance enhancing but it does enhance the player's likelihood of injuring themselves or someone else. They should not be allowed to train/play.
It's not the crime but the cover-up that will get you. That old adage is the most salient for me in regard to Wilkie's parliamentary comments. The hiding/secrecy just demands close examination by those who care, those in the media and those in official capacities.
Lastly, any player who is omitted from a team due to general soreness, hamstring awareness, ... will now draw the askance looks. "Is he/she on the gear?"