Originally Posted by BillGrissom

Sounds "intrusive". Was this a surface street or freeway? I wonder if they only stop cars that appear to be polluters or if truly random. I think there is a state provision for the former, and have heard of "across the road" sensors to try to identify specific cars. My EGR is also removed, and I expect my car pollutes less without that complicated contraption that may not have been working correctly. Don't know if they would have details on what my engine is supposed to look like.