It's the lack of a definite link between the vials and the needles and the player's arses, that was the problem, as Jake Niall explains.
http://www.theage.com.au/afl/afl-ne...idoping-tribunal-hearing-20150331-1mc2nb.html
And I'm not of the same opinion as most here that the tribunal itself was corrupt. The article explains the frustration the judge has with the witnesses not appearing. ASADA, through this in-house process, are toothless tigers. I'm sure they probably even knew this.
The question then is how far up does this have to go for the tiger to get teeth. I've tried to do some research but can't find whether CAS has subpoena powers. They are going to need to have witnesses under oath.
... if it doesn't then ... remember your needle, but forget your pen, because it's open season.
And that is/was 100% stage managed with the AFL's full consent. It is not out of the question that it was the AFL's own work.