For a sport like football and the money involved I'd hazard a guess it's rife, with testing being pretty much non existent.
How many players have been done, even just in Scotland.
Jordan McMillan? And even the story behind that is dodgy and probably has a lot to do with the company he keeps.
I mean back in the 70's George Best was legendary for going on 3 and 4 day benders. Now I'm no toxicology expert, but what I do know is if you're drinking heavily, you can't stay up for days without a little white powder pick me up. Its the elephant in the room.
Outside football. Michael Jordan, Dennis Rodman, Alan Iversen, notorious for their week-long parties. Without a doubt fuelled by the finest Peruvian money can buy.
UFC. Check the amount if guys who were elite level. USADA was introduced and they miraculously fell off a cliff.
6,7,8 fight win streaks. Then lucky to win 1 in 5 after USADA.
I've no doubt football is rife with it.