HAHA, I'd like to see that 50 second 100 meters there
As for track and field, ya know I have no idea. I only know general USADA rules and their specific implications for swimming. I mean there are plenty of masking agents, ways to avoid failing...the Chinese government used to alert coaches when drug testers entered the country so they could deal with it. There are ridiculous stories from them...plus, I'm not totally sure, but doesn't the BALCO stuff involve a drug that had never been used before, or banned before? Technology always seems to be coming up with new ways for athletes to cheat, and I can't really speculate why it's so much worse in track and field.