Future of Arizona's Virtual Fence In Jeopardy?

Nov. 11, 2010 — -- 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."

"This is about a solution which we believe is going to do the job," Michael Chertoff, former head of the Department of Homeland Security, said in 2006.

Watch A Special Edition of World News With Diane Sawyer From Phoenix, Arizona For More On This Story.

Boeing was brought in to build the surveillance system in southern Arizona. It was intended to be a high-tech wonder linking sophisticated monitoring technologies to the Border Patrol to help identify and thwart human trafficking and drug smuggling. Towers with the radar system were supposed to be erected throughout the 2000 mile border with Mexico. From the start, there were technical issues.

Just four years since its inception, only 53 miles of the border are dotted with the spotty radar towers. Close to $1 billion of taxpayer money has been spent and the panned project is close to being canned by the Department of Homeland Security.

"We cannot continue to invest hundreds of millions of dollars of taxpayer money into something if we're not confident it's really going to work," Secretary of Homeland Security Janet Napolitano said.

What was supposed to be a high-tech answer to immigration has turned into a jumble of weak cameras providing blurry images, unreliable radar that sometimes confuses cars for humans, and slow software that is unable to track people in real-time. And on top of all of that, the virtual fence reportedly performs poorly in bad weather.