I'm not so sure on that. Some of the states that don't test are pretty damn inhospitable to cars and bad emissions is often the first sign of the end of the vehicle.

But there has to be a pretty lucrative trade in buying 'scrap' (emissions failing, $50 for-the-steel) cars in some states, and shipping them over to non-testing states where they can be sold as 'kinda old but totally usable for a few more years, $3000'.