Yeah several times supp companies have gotten nailed for having AAS in the supps.
I know exactly what you are saying and i agree with you 100%, a lot of the NCAA football players i knew were on Gear the whole time they played. My cousin was on Anavar and Winnie tabs and he had the highest bench press on his team, so when the NCAA came in at the beginning of camp they tested him and he failed. He was a moron and took the stuff right up until camp and he got busted.
The only reason im telling Lene to not do it is because what he wants to take (arimistane) is going to yield very little results and he is going to assume he is good to go, but you never know what could happen.
If he wanted to run a real cycle and was asking how to get away with it, that would make more sense to me.