Nationwide. Like I said all I have heard about is the cattle market. All cattle in the US as of July 15 will be grandfathered in as "born in the US" and they will go from there. All big sale barns already have the equipment for reading tags in place and the extra office help to do the paperwork. A state can not pass a law that supercedes Federal law, They can make a law stricter but not more lenient.