For those not in Aus, there are 2 issues here, and lots of people (including the media) get really confused about stuff.
1 - Performance Enhancing Drugs. Whilst we are all clear about PED's and what is involved, many in Aus are not. The AFL signed the WADA code in 2005 only after being basically forced to by the Australian Government (funding would be withdrawn if they didnt).
They are allowed infusions etc (the no needle policy for cyclists is not a WADA thing) but there are some restrictions on what they are allowed. This is likely to be reviewed now though ... possibly with all infusions being banned.
2 - illicit/recreational drugs. Recreational drugs are a HUGE problem in football in Australia. Basically, alcohol puts on weight whereas drugs dont ...
The AFL has a "three strikes" policy. They do out of competition and in-competition testing for illicit drugs (as well as PED's). The first 'strike' ONLY the player gets notified. Not the club and not the AFL. Second strike the club gets notified, and third strike they get a 12 month ban. Even for out of competition.
The AFL have taken a lot of stick for this ... many people saying it is simply too lenient (even though most sports do not have a ban at all for out-of-competition recreational drugs.
A few years ago, one of the clubs (west coast eagles) captain, club champion and brownlow medalist (league MVP) had some issues, and eventually admitted to having a major drug addiction. He had never tested posative, but was banned from football for 12 months for bringing the game into disrepute. He was involved in a local bikie group ... which is presumably where he sourced his drugs.
At that time, many clubs all distanced themselves saying 'oh no, we definitely dont have a drug problem' etc .. but I do believe that many have at least attempted to sort some things out.
Anyway - the ACCC report that many clubs / players are involved with criminal associates etc is not actually that surprising to many clubs. Collingwood especially has been surrounded by rumours for quite some time about the activities of a number of its players (one player was in a car involved in a gang related drive-by shooting a couple of years ago)
But that all is one side of things - and the PED's / sports science is another. They are 2 separate issues, but seem to get really muddled in the media and the minds of the fans here.