I heard about that maybe twenty years ago. At the time, it was a proposal--to verify vehicles without requiring an actual emissions inspection (where the vehicle owner could "tune" the vehicle to comply, then "un-tune" when the sticker was on the windshield.) Mail out the tickets just like automated red-light cameras, or automated speed enforcement (i.e., a semi-criminal public/private enterprise where the State is complicit in extorting money from We the People using whatever means can be "justified" enough to pass the Legislature, with much of the resulting profits absorbed by whatever corporation has the Government contract to run the scheme.)I was somewhere recently (Colorado I believe) where I saw one of those drive-by emissions units situated on an on-ramp. I don't know how "smart" those things are... if they're just profiling the aggregate emissions or if they're checking each vehicle... and maybe taking pictures of license plates too.
And if they aren't checking each vehicle now, they may in the future.
I did NOT know that remote emissions testing was in-use. I thought the whole thing died and wasn't revived.
How wrong I was.