No state in the union is on the front lines of the immigration debate more than Arizona.
Each day, 3600 border patrol agents roam the desert border with Mexico trying to stem the human tide of thousands of illegal immigrants that daily attempt to cross over from Mexico.
In 2006, an invisible fence using high-tech radar towers was proposed as the answer to illegal immigration in the United States. It's called SBI net, known to most along the Arizona border simply as the "virtual fence."...Full Story