In the pharmacology of alcohol there are too many influencing factors in estimating one's breath alcohol content. The emphasis is now on public breath testing, not on counting your drinks or understanding the confusing standard drinks policy.
The Victorian State limit is now 0.049g/100ml. In excess of this the penalties are severe. Counting drinks or estimating what a "standard drink" is presents too many inaccuracies. A breath test eliminates any doubt. RoadSafe VIC now embrace the "public breath test" concept to reduce incidences of drink-driving, these campaigns are known to be successful.
Monash University Research Centre concludes that there is to be found a reduction of 16% in drink driving should these instruments be made more widely available.
Further: "They ponder, why are hand dryers compulsory in licensed premises
and not public breath testers?"