ban served = clean 'til caught again.
Except for that problem of limit-exceeding training.
ie. if you take steroids and train then compensate to a capacity above what you would have achieved clean, your body has hit that 'super capacity' point and done whatever adaptations are needed so it's possible to reach that point again.
So, once a doper, always potentially reaping the benefits of doping. Also, if you've made the call at any point in your life to cheat then you are morally weak and susceptible to do it again.
Life ban for cheats.