One for the road

So they intend reducing the permitted blood alcohol level further for drivers.
I remember when the evidence for road accident frequency and alcohol was first used to justify a law change.
The published graphs showed an exponential increase in accident frequency compared with individual alcohol consumption. But on the far left of this chart, before the accidents and the alcohol started mounting up there was a tiny dip, like a tick, a little valley before the graph took off into a large hill, practically unnoticeable.
The only interpretation is that 1 drink makes you a safer driver. I can’t find that graph now maybe it has been forgotten about. More likely it is unthinkable in this ‘free’ society of ours.