When my friend Alex crossed the border for a Christmas ski trip and told a funny story about the American border guard, I went to Google Maps to see the border crossing. I was also thinking about the mountainous terrain and how easy it would be to hike across at that point.
Lo and behold, the map on the U.S. side had been fuzzied out for a ten mile range so that you couldn't work out a walking path using Google Maps.
Some bright person put one additional barrier in the way of a Muslim Jihadist, an Arab Revanchist.