All the kinks need to be worked out first.

who may be AMONG those most at risk for DUI, but comparatively poor, buy this new technology that everyone will pay for?

That said, I certainly appreciate the need.

My neighbor starts his truck, locks the doors and goes to the bar and jumps in his truck and heads out drunk

How would that even work if you are the designated driver and your passengers are like Kegsbreath or Pirro? The false positives could be more deadly than the small risk they're managing. And a false negative would open the door for liability of the car manufacturer, "Why did the car you manufactured fail to stop Kegsbreath from driving drunk?" would be a cause of many lawsuits, as well. Most people do not drive drunk or impaired. This sounds like a solution in search of a problem that is relatively low probability.

That thing woulda shut my car off before i got to the end of my driveway this morning.

Let me que you in on a lesser known fact that happened to a relative of mine.

Here is the scenario:
You are over 21. No criminal record. Not even a speeding ticket. You have had some drinks and broke and but are not so drunk to make a big mistake decide it's not safe to drive home. You decide to curl up and sleep it off. Three hours later you are woken up with a tap on the window. It's the police.They pull you out of the car and arrest you for driving while impaired.
Mind you, you were asleep, your engine is cold, your keys are in your pocket. You were not driving. Police acknowledged all that was true. The problem isn't that you were driving while impaired.
It's that you were asleep in the driver's seat. If you had been in the passenger seat or back seat it would have been fine.
Many states have that rule. So even though you were doing the right thing you are still charged like you did.

Now mind you they were lenient in the sentence. Suspension of license for 30 days. Interlock on vehicle for 2 years (at a cost of over $200/month and if you can't pay it you go to jail for up to a year or more). And your car insurance goes through the roof. Plus you are banned from most international travel, potentially for the rest of your life (by the country, like Canada for example, they will let you appeal after 5 years but otherwise it's a lifetime ban)

My point is will states and lobbyists for companies that make things like interlock systems, pass laws that if you fail these checks police come arrest you simply based on the car readings and how the hell do you defend yourself against your own car?!?

This is a perfect example of unintended consequences.

Gloves in winter, hand sanitizers, allergies giving bloodshot eyes, etc. the first instance a car shuts down mid drive or won’t start on a winter day will kill any public demand for equipped cars and those equipped will be quickly disabled by owners.

This was a stupid idea, and I can’t wait till it is repealed.

Heck, I don't even want my insurance company monitoring my driving, even though they claim they'll give me a break on rates.