Is it time to make drink driving zero tolerance?

With the introduction today of a new lower alcohol tolerance  in Scotland now making it different to England, is it time to just make drink driving zero tolerance?

1 in 7 deaths on the road are attributable to drink driving.

So what does the reduction in the driving limit from 80mg to 50mg of alcohol per 100ml of blood, actually mean to you?

People process alcohol at different rates, based on age, gender and weight.  As it is difficult to be scientific about how an individual processes alcohol due to people’s different physiologies and metabolisms, does this just add  confusion to motorists about how much they can drink and be safe to drive within the legal limits?

Might we just as well go for an outright ban?