[FullMtlAlcoholc]

> Therefore I would be quite happy to have something built in my car that checks I'm not drunk before I turn on the engine

If that's truly the case, it's trivial to get a voluntary interlock ignition device installed on your car. You'd most likely save on the cost since there is no government mandated reporting.

That said, I'd recommend not driving at all if you know in advance that you are going to be drinking. At least in metropolitan areas, there are far too many mostly affordable and convenient options IMO to risk it. Even a couple of drinks for a 180+lb person is going to cause impairment.

[isostatic]

I was thinking mainly when I'd had a bottle of wine the night before, what time am I clear the next morning