Catalytic converters
In CO they test on a Dyno and run the vehicle on a program. The tester has to keep the vehicle speed on a line that moves up and down. I assume it is simulating the real world. The first time the tester did it he kept hitting the brake to maintain the speed. I imagine an untalented tester could make the test fail just by how he keeps the speed on the line.
It is getting pathetic.
Colorado the new California