None of you know for sure, unless you're a close friend of his, which I doubt. I believe that Mike would have a great body whether he used steroids or not. The guy is a genetic freak by all means. He's always been big, even at a very young age (early teens). His fighting weight never really fluctuates that much and he's been at it for a long time. He usually always weighs right around 220 lbs, never 15 lbs lighter or heavier. I'm not saying that his trainers never had him on something to increase his aggression like Halo or the Cheque drops mentioned earlier, but he doesn't need steroids to have an incredible build. He is truly gifted in having a very bulky muscular body.
BTW, he has a fight coming up in February, I believe it's going to be on Showtime. I can't wait!
NN