There are spots across the country. You have to look at topography. Some places are easy to cross, such as the Prairies, which are flat and not much of a deterrent, as opposed to going up over mountains and canyons and falling down into water. We weigh some of those issues, but we truly rely on our intelligence from our partners to look at where those high-risk areas are, and where intelligence is suggesting we need to respond with resources and perhaps more technology.
On December 9th, 2013. See this statement in context.