From the Age
Aviation sector faces widespread drug testing | theage.com.au
Under the system, any staff member of an airline, government agency, engineering or ground services company found with a blood-alcohol level of more than 0.02 per cent, or any trace of drugs, would be immediately stood down. The worker would have a second test and see a doctor for an assessment.
If a doctor detects a dependence problem, the employee will enter rehabilitation. Staff whose misuse of drugs or alcohol is assessed as one-off or out of character will be able to return to work after a brief break. Offenders may also face fines up to $5500.
Still seems to me to be a 'guilty until proven innocent' approach to a low occurence/fatality/injury issue. (but unfortunately a high-profile issue)