Now lick the knob

No, but not every car has a breathalyzer. Only repeat offenders get one of those. So the point still stands imo. Maybe someday the saliva test can be hooked up to the ignition.

They can be used when pulled over just like a breathylyzer (although this is the law in my state and I'm in USA all places may not have the same rules) but I do see what you are saying about hooking it up to the car like the breath machines.

Man, someone could potentially make a lot of money to be the first ones to roll that out.

That's honestly a very odd reaction, for what it's worth I meant it lightheartedly.

Of course I think pedestrians and cyclists also deserve safety.

I would like to point out however that a majority of incidents are drunk drivers who do not already have a device like that in their car, so it's a tad bit absurd to indicate your hard line for legalization is that when it would only apply after the fact anyway.