LOL a nation whide inspection system would take a decade to put together. Plus the States have always controled cars they are not going to give that up. Could you imagine the same emissions law in NYC as in Nome Alaska. NYC 650 cars per sq mile. Nome, 10 sq miles per car.

Federal Goverment controls how the cars are made and how much warranty is on all emission parts. That is not going to change in the next 20 years. Atlease not with out a lot of notice.