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I remember studying optical technology that can "sniff" your exhaust as you drive by, back in the 70's. Sort of like the inspection sensors for trucks that determine any wheel that's overheating and flags that for further review. Police cars now have readers that instantly capture license plates and look them up in the cloud for other concerns, like valid registration & inspection, not to mention warrants. The authorities know where every vehicle goes & when … in cities that do that. Don't need to stop and pay tolls anymore in places, they bill you. I'm sure face identification isn't far off with that. Pretty soon every vehicle will be part of on road network that will have uses we haven't even imagined yet. Welcome to the 21st century, like it or not.
Don't know where you got the "20 year old" exemption, not true.
There has never been dyno testing in NYS either?
https://dmv.ny.gov/brochure/new-york-state-vehicle-safetyemissions-inspection-program
I stand corrected. Always ready to learn new things, thanks.1999 NYS
The dynamometer test is the centerpiece of a new emissions-testing program required in the New York metropolitan region by the Federal Clean Air Act. In New York State, nine counties are affected: Rockland, Westchester, Nassau, Suffolk and the five boroughs of New York City. The new test is conducted along with the safety inspection that has long been required. The combined emissions and safety check costs car owners $35, compared with $19 for the old test.