I don't know why Shane would bother to appeal, though I didn't read what his exact charge was.
He admitted taking the tablet though. It would have to be the height of stupidity if nothing else to take a drug without checking first.
There will always be questions hanging over him as to why he took it, but the fact is it is illegal for whatever reason.
With all the info available there would be no excuse for an elite sportsperson to be so stupid.
He should cop the punishment on the chin, like Charlesey did imo.