What is clear is that even very small amounts of alcohol affect your driving.
Drivers with even 20-50mg alcohol per 100ml of blood are at least three times more likely to die in a crash than those with no alcohol in their blood [8].Drivers with BAC of 10mg/100ml, far below the UK or European drink drive limit, are 46% more likely to be at fault in collisions than sober drivers [9], and when they crash, do more damage than sober drivers [10]. That’s why the only safe amount to drink if you’re driving is nothing at all – not a drop.
Male drivers – three quarters (75%) of drivers who fail breath tests following crashes are men [4], and twice as many men as women admit to drink-driving.
http://www.brake.org.uk/events/15-fa...-drink-driving