The biggest myth about PED's is that "big muscles" are the main giveaway that an athlete is using. PED's are used for endurance and recovery as much as power. Testing in general is way behind the drugs. Add to that the fact that sports are a big business....and the organizing bodies and sponsors would hate to see superstars be found out as cheats. Lance Armstrong is a perfect example. The French where suspicious of him for YEARS...but we here in the states thought it was sour grapes...how could this cancer survivor be a cheat?! He took all the tests, etc. Up to the last moment...when Lance finally admitted he cheated...some of his fans where trying to defend him. While it certainly shouldn't always be the case...it seems athletes that come under suspicion for PEDs...are more often then not....guilty.