Wouldn't be allowed back in. I don't think Bigfoot's ever been formally nationalized. Gets back to the border from his Mexican sojourn and is told he can't re-enter legally.
There are a number of normalization algorithms. Easiest would be to just divide by the area's population count. That gives you the relative number of bigfoot sightings or fursuits per capita, removing any skews introduced by varyin population size.
Say you have two areas:
Area 1: 100000 people, 1000 fursuits, 500 bigfoot sightings
Area 2: 1000 people, 10 fursuits, 5 bigfoot sightings
Without knowing the population size, it looks like more fursuits means more bigfoot sightings. But if we divide by the population size, we get 0.01 fursuits and 0.005 bigfoot sightings per person in both areas.
There is one fursuit owner being detained at Guantanamo. The CIA and FBI have neither confirmed nor denied whether said person fights the torturers by shouting "HARDER, DADDY"