Excuseable reasons for failing drug test?

I'll bet you I know where the cold medicine myth comes from! Lot of Olympic athletes (Silken Laumann from a number of years ago) have failed sports "drug" tests due to the Ephedrine in cold medications - but they aren't testing them for illegal drugs! They are testing them for performance enhancing stimulants! I think these people here about that, and somehow figure it is an excuse for "regular" drug tests.