I don't know about that, cheating is an accepted technique for advanced lifters/bb's. I believe there is a method to their madness. For example if I can get 6 good reps on curls, why not cheat on the last two and get 8? It's like forced reps. Of course this is only for experienced lifters who "can" cheat, or know how to cheat without hurting themselves.
Bret Favre's back up QB said "Why do I have to do it this way, and Favre doesn't (talking fundamentals)? Coach --> "Because he can, you're not Brett Favre, stick to the book."
Of course they do 'roids, but so do a million other's whom you've never heard of, it's not the roids, it's the work ethic, technique, and of course genetics.