Well if he was using while playing he was never caught. To be never caught using when playing you’d have to be pretty smart. Not sure if you’ve seen Jake’s standover career but it wasn’t very smart. Ergo doubt jakey was smart enough to not get caught using while playing.
I don’t think you have to necesssarily be smart to get away with it (it helps), just lucky.
Remember that if WADA didn’t appeal to CAS, then the Essendon 34 would have gotten away with it and that program was a complete shambles.