On a bike, the rider is the engine. And a brief study of the history of NASCAR will tell you that a great deal of the development is outside of the rules. The first guy to use a seat belt was accused of cheating. I'm just saying that riders are going to do everything they can to compete at the highest level they can. Specially engineered diets are ok. IV drips of vitamins are ok. Training in controlled oxygen environments is ok. It doesn't take much of a leap to get to injecting extra red blood cells. There is a large grey area between whats ok and what isn't. As methods advance, the difference between right and wrong is blurred. I say let they do whatever the hell they want. If they go to far, they shorten their career, and pay for their mistakes. If it comes down to who can handle the most performance enhancers before their heart explodes, so be it.