I have not heard of any emission checks or testing here in CA. There is a federal law that went into effect at the beginning of 2007 not allowing exhaust system or emission system mods on bikes 2005 and up. That law is being challenged due to the fact that nobody has any emission level standards, procedures, or equipment for motorcycles yet. You can bet that CA will be first in line when that stuff becomes available.
Arizona does check on a yearly or every other year basis of motorcycle emission systems. No mods of factory systems allowed.