As a long time loiterer, I didn't want my first post to be in this thread but it is undoubtedly a timely discussion.
The cases alluded to in the report and online can all be found in public media releases on the ASADA website as they aren't part of the 'unnamed' report.
We need to remember that in the 2000s rugby topped all sports in the UK with positive drug test results and even the Springboks have had positives in the last 2 years. As Victor Conte likes to say, failing a drug test is a mental failure. They are that simple to pass and yet rugby sees positives.
To assume rugby is completely clean is a stretch, however practises in Australia are generally better than elsewhere and our TGA blocks alot of stuff that is OTC elsewhere.
Everyone is also assuming the rest of the world operates on our level. The US Olympic committee have a history of covering up positives, most famously Lewis, and testing procedures in many countries where compliance issues could involve the government are questionable. At least the Australian govt and ASADA as independent and seemingly proactive on the matter.
I think the biggest concern for rugby (globally) is that of 7s. It is potenitally the "perfect storm" for doping demand. High power:weight ratio like sprinters is required, strength for collision, massive aerobic systems not only for on-field performance but also match to match, day to day and tournament to tournament recovery is required. Most of the matches involve play well above the anaerobic threshold. Not to mention that teams fly half way around the world, spend a week there, play 6 games in 2 days, fly back to the other side of the world and repeat the process.
As an example in the last two week space the USA team had 2x 15+ hour flights, plus 12 games of 7s. European teams had longer flights. At 84 hours recovery from an NPC game of rugby recovery is incomplete (without any flights), and having the fastest/fittest players is irrelevant when they are only at 80%. Given we know that the standard of the game, not the individual athelet determines the operational requirements of speed, , the demands on the bodys of 7s players is extreme.