This is my first post on Pprune after lurking for several years. Be gentle!
I attending one of the briefing sessions in Brisbane. In fact I was the only attendee - personal briefing.
The real hidden danger here is the drugs testing. There are a plethora of over the counter drugs which will give a false positive in the tests and the tests are designed to detect drugs taken in the past 7 DAYS. Don't worry about the Panadiene or Nurofen Plus or poppy seed bun that you had last night or this morning its the one that you had last Saturday that is more likely to get you caught out.
There will need to be a significant education program as to what can give false results or there are going to be a lot of pilots, engineers, refuellers, baggies having a couple of weeks forced leave.
FWIW, As it stands I think that the legislation is unworkable. The implementation date of the random testing has been a regular question at the senate estimates so it is fairly clearly being pushed politically.