as in HP, weight, etc...
Either known or unknown by the racers, are there?

Every other sport has it's own version of steroids - why would we not expect the same in racing?

For the record, I believe in the most recent situation, the "Athlete's" were unaware what the "Trainer's" were prescribing.

I don't want to beat a dead horse topic - just thought I'd bring it up for discussion outside of the taboo area's (manufacturer's, sanctioning bodies, engine builders...)