The border was relatively quiet this far out into the desert. The actual line in the sand was marked with a series of barbed wire fences, fitted out with contact sensors, listening arrays, and anti-personnel radar. This "electronic curtain" was said to be sensitive enough to distinguish an individual person, but José assured us that it was unreliable to the extent that half the time it was ignored. Both the Azzies and the rangers had chased after jackrabbits too many times to be bothered with any more false alarms. Larger radar signatures, however, were taken very seriously indeed.