zip code and state mismatch, unvalidated

I am able to enter anything into the City, Sate, and Zip Code fields and the order will continue. When I enter a zip code that is not in the state, it will go through. This is an issue because it allows customers to bypass tax added to their order by inputting a different state. This issue was under with United States selected as the country. Shouldn't there be some sort of validation if the zip code matches the state?