One word for you: dieselgate
Someone did go to jail, so there's at least that.
Friendly reminder that _all_ automakers - European, American, and Asian - had been doing this emissions cheating for decades.
Detection of the car being on a rolling road, special button combos that trigger the emissions testing map, etc
A process not working on occasion doesn't mean the entire verification method is garbage.
I get the desire to not have to trust a third party, but realistically, there isn't a way to function without doing so, outside of going out and living in the forest in a cabin you've built yourself, either doing without electricity, or with solar panels you've built yourself from raw materials.
Human processes aren't like computers. They're messy. They fail sometimes. They need checks and balances. Sometimes those checks and balances don't work. Sometimes the checks only work well after the fact, and the people who were harmed aren't all made whole.
That's life. We probably can't do much better.