california rolled out something else, i think everyone should be worried about:
REMOTE SMOG SENSING
Remote smog sensors are appearing along California roadsides to measure emissions from cars as they drive by. The entire process takes about three seconds.
(1) An infrared beam shot across the highway picks up the contents of a car's exhaust. A calibrator and computer on the other side of the road screen and measure the emissions.
(2) At the same time, a camera snaps a pictire of the vehicle's license plate. The state uses that in information to find and notify the vehicle's owner if emissions are too high.
So basically you could get a ticket in the mail saying your car is emitting too much smog and that you need to get it retested!