All sports are the same these days Westie. They deal with what becomes public, and then try and manage it there after, what doesn't become public doesn't have to be managed.
Cousins was outed. Plenty in all sports have the same problem. Plenty of mail to suggest a few very high profile (and lessor profile) AFL players have tested positive for the same drug through the last few yrs, all well known to the AFL, but well managed in house, deliberately, and not in public - they call it damage control (if it doesn't get to the public it doesn't damage the image or sponsors).
The ARL had a very high profile Australian player test positive a few yrs ago, who was then directed (told) as to how long he would be out of the game and it was his (and manager and club) call as to what what injury he'd come up with for the media. Another ex Australian player who these days has a very high profile in the media who tested positive to steroids, was tapped on the shoulder by the ARL following the test and soon there after retired "due to injury".
It's the same with salary cap rorting and alike, in any code. The managing bodies always like to try and manage any such problems in house, as opposed to it ever hitting the media and them having to move to damage control. Have the ARL ever exposed salary cap rorting? No. How were the Bulldogs exposed - a "used" and unhappy sponsor who had been a party to paying players overs (in addition to their declared payments) who had been over looked for a major development contract went (cryed) to the media. In between the ARL tried to lean on the media (Fairfax) to go quite on the story.
It's all political, business / corporate management at its best. No game is any different to another. And today, unfortunately drugs are common place with all out youth, not just sporting players. It's a problem society has to somehow deal with, not just the sporting bodies.