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Hmm. How will they check for alcohol? Would you still be able to drive home a car full of drunks while sober? Only with all windows open?

It's a solved problem today. See Interlock Breathalyzer.

Do they still give false positives?

More reason against requiring it in all cars.

Solved as in it actually works? Or it works like the gas detector in my kitchen that alerts when we cook meat with a bit of wine in the oven? :)

Requires a starting sample and samples at random times afterward. It’s very intrusive.

"at random times"... for example when i'm taking a curve at the speed limit? :)