That depends. Each state has a different disease prevalence and disease status.
There are opportunities to look at a zone, but they need significant scientific information and assessment in terms of, again, the prevalence of the disease: when they last had outbreaks, what kind of surveillance they have in place and what natural barriers are present that don't allow the disease to come into a state. There are a number of scientific parameters and risk mitigation options that CFIA would look at, if there is scientific evidence provided for us.