It's not just the emissions laws that prevent the cars from entering this country, and it has nothing to do with other countries not doing there part, laws are just different. It is mostly the d.o.t. safety rules that the cars dont pass, and thus prevent their importation. things like bumpers that aren't to spec, air bags, Ride height, and so on. However if you really want it most cars can be made compliant or exempt for the right amount of money.