Is The Border Fence Working?

Mexican nationals storming the border near San Diego, day and night. That was the early 1990s.

Today, on that border is double fencing, stadium lighting, surveillance cameras and motion detectors. It's the most heavily fortified five miles of the border - all monitored from a command center near San Diego, CBS News correspondent Bill Whitaker reports.

"Over the years the San Diego sector has been able to incrementally gain operational control of this area," said Michael Fisher, the San Diego sector's chief patrol agent.

Proof? The number of people caught crossing illegally has dropped dramatically from 600,000 a year in the early '90s to just 153,000 last year.

Fewer apprehensions means fewer people sneaking across, says the Border Patrol.

Only 670 miles of the 2,000-mile border are to get fencing and that's behind schedule. The price tag: $1.2 billion, says the Border Patrol. That's up to $3 million per mile.

But factor in life-time maintenance and congressional researchers say the price could top $50 billion.

But won't they just move on down the road to the next property?" Whitaker asked.

"They will, they will," Hodges said. "It's just not going to stop as long as there's a market for illegals."