I think that doping exists way beyond track and cycling (e.g. rumours had it that
Operation Puerto found bags and bags of blood from top Spanish football clubs, as well as blood bags from Nadal, but these were covered up by Spanish investigators), but it's just those two spots which benefit the most from doping, being very much endurance or raw power sports. The testing in cycling is also much more complete than many other sports, and I still think that most top level cyclists dope. (And I watch / follow a lot of cycling.) A lot of modern doping techniques are undetectable and they stay ahead of the ball (as Bruce aluded to, e.g. BALCO).
And, yes, I am that cynical that I would be absolutely shocked if there wasn't doping in top level rugby (both union and league) in Australia.
Then I feel sorry for you mate. BALCO is the only seriously committed doping laboratory to have been exposed pretty much ever. Sure it is feasible that new synthetics pop up every now and then from independent researchers but without a setup/funding/personnel like BALCO had it is unlikely that independent drug producers would be able to fund development to such a rate as to fully "stay ahead of the ball" as you say.
Read the latest research and you would realise that over the last decade 3 things have happened
1. Because of the BALCO informant, WADA and other anti-doping organisations were able to reverse engineer tests for a large percentage of the "designer" (read: previously undetectable) steroids and other performance enhancers. The % of athletes returning positive tests has not increased significantly, the inference being that doping through steroid and synthetic hormone use is not as rampant at the top level as many had hitherto believed.
2. A few years back a hormonal profiling technique know as the "Biologic passport" was introduced, which is basically a snapshot of the hormone, blood plasma, haemoglobin levels and a whole bunch of other biologic markers taken during the period at which athletes enter professional sports (definitely with olympic events, cycling, AFL I believe etc.). The random drug tests taken throughout an athletes career now mandatorily involve a repeat test, with the new results being compared to the original. Disparities are investigated further (this is how Contador was caught). Therefore even if the tests for drugs come back negative, ALL performance enhancers have some kind of measurable effect on specific endocrine or metabolic systems. A significantly unusual result is now considered "proof" of doping, they dont have to know what you took, only that you took something, which is relatively easy to see because of the passport. Again, the % of athletes has not increased to a statistically significant degree, indicating that drug use amongst the elite is probably rarer than many of us (me included for a while) believed.
3. A decade and a half ago they developed the technology to keep sample viable for testing for 8 or more years. Every time a new test is developed for the latest gear, they go back a re-test old samples (this is how Barry Bonds was caught). This would mean that private, usually not significantly funded, independent doping researchers have to be 8 or more years ahead of WADA and its affiliates in what they are producing in order to keep athletes tests showing nothing. Again, the % of positive results upon re-testing was not huge, indicating that not only is doping relatively rare nowadays, it was not as rampant in the past decade as was commonly believed either.
I personally can't think of any rugby players in Australia (I have no comment on league) who have the type of physical capabilities or have undergone such a physical transformation that would cause me to speculate as to a possible doper.
I realise that many high-profile doping cases have been mad very, very public over the years. But if you think in relative terms, surely you can see that the incidents are fairly isolated. I disagree with your assertion that many elite cyclists "all dope" or your strong feelings that top level rugby almost certainly contains elements of doping. I definitely cannot say for sure that it does not exist in rugby in Australia, but I find it exceptionally unlikely it occurs at the top level.
Please try to avoid infecting others with your cynicism, it is unfounded.