Anyone got a reference for the 0.02?
CASR 99.010, Definitions:
"permitted level" means:
(a) for a testable drug--a level of the drug specified in subregulation (2A) for the purposes of this paragraph; and
(b) for alcohol--a level of alcohol of less than 0.02 grams of alcohol in 210 litres of breath.
The 0.02 grams of alcohol in 210 litres of breath equates to a blood alcohol concentration of 0.02%.