For starters, doctors were among those givingi ballplayers the PEDs in the first go-around with this. And players often sited injury recovery as the reasoning, not performance enhancement. So the notion that the drugs would be used up to the point of health recovery and not an inch further is pretty naive IMO, as well as the notion that any team would be justified in telling a player "no you're not hurt" when he insists he is. It would require a complicated system of checks and balances and even then, I'm not sold on the worthiness of it. I don't want a league full of HGH-healed, 43 year old Bartolo Colons hogging roster spots well beyond their natural decline.