Other Transport Industries face similar scrutiny, why should we be any different?
Because with such horrifically low detection rates, on an expenditure vs. improved safety outcome basis, the money could be much better spent in other areas of aviation.
In the last few years, how many incidents/accidents worldwide can be attributed to drunk pilots? None I'm aware of.
In the same period, I can think of at least four separate incidents where pilots with unstable mental health have caused a serious incident or accident.
On those numbers alone, it means that surely this money would be better spent by CASA investing in the mental health of pilots - ie 1x free psych appointment per year to talk about your career, life at home, job security stresses, family or marriage problems etc. etc.
It's not rocket science - spend the money where it will have the GREATEST positive impact on safety.