Hasn't Ron Harris admitted to using before and more recently getting off because his body doesn't respond all that well?
That's what I gathered. He talked about using, weighing X in shape, then not using for a good while and being only 10-15 lbs. shy of X at later contests.
Having seen some of Harris' workouts (really struggling with three plates a side on the Hammer Incline), even if we're fair and say, "Oh, he's six weeks out there," I find it hard to believe the man was swimming in shit at that point.
Just the same, I've no doubt in the world there are very poor responders to gear. I wouldn't necessarily say he is, but he's either not on a ton of shit when he's "clean" or he's doing something very wrong.