Delaware National Guard building border wall in Yuma County AZ, Aug 2007, as part of Operation Jump Start
YUMA SUN, Feb 27 08
"Physical barriers must be patrolled and maintained, and that can be costly. They also can be breached by those who are determined to do so. And building them can compromise property rights and disrupt fragile terrain...
technology... we would hope it could become the primary way to control the border rather than continuing construction of hundreds of miles of physical fences."