From
Grey import vehicle - Wikipedia, the free encyclopedia:
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NHTSA and Environmental Protection Agency (EPA) regulations criminalise the possession of a vehicle not meeting U.S. standards. Even Canadian-market vehicles may not meet these requirements.
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It is no longer possible to import a non-US vehicle into the United States as a personal import, with four exceptions, none of which permits Americans to buy recent vehicles not officially available in the United States.
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This is not state-by-state, but at the federal level.