Well, after we confiscated the weapons he didn't seem that dangerous

In Maine, a man comes to the United States and is stopped by the border patrol. The agents found a homemade sword, a hatchet, a knife, brass knuckles and a chain saw stained with what appeared to be blood. Once they took the weapons away, they let him into the county. Click here for story. The next day police in Canada discover that the man's wife and elderly neighbor were hacked up in the man's home.

I know Stephen King sets all of his stories in Maine. So maybe the border patrol just assumes this is normal in Maine.