[UltArc]

Originally Posted by NachtRitter

From Grey import vehicle - Wikipedia, the free encyclopedia:



and



This is not state-by-state, but at the federal level.

A few lines down it says this.
A vehicle not originally built to U.S. specifications can, under certain circumstances, be imported through a registered importer who modifies the vehicle to comply with US equipment and safety regulations and then certifies it as compliant, and an independent commercial importer who modifies the vehicle to comply with US emissions regulations and then certifies it as compliant.[3] Those who import nonconforming motor vehicles sometimes bring in more than one car at a time to spread the substantial cost of the necessary destructive testing, modification, and safety certification. Destructive crash testing is not always needed if the vehicle can be shown to be substantially similar to a model sold in the U.S. The Smart Fortwo was imported in this manner prior to its official U.S. release.

I didn't read it all, and I am not a professional. I will have to research before I take a stand at one point or another. But I am under the impression that it can be done, and not always with the thousands of dollars of testing.