The most expensive fence in the U.S.

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The most expensive fence in the U.S.

"In a nutshell, it will cost $6.5 billion over the next 20 years to maintain the fence along the U.S.-Mexico border. However, despite the fact that $2.4 billion has already been spent to build 633 miles of fence along the southwest border, there's no way to evaluate cost-wise whether the fence has helped to control the flow of illegal immigrants.

The GAO noted two big problems with the fence. One is that people are still getting over, under and through it. As of May 14, there have been 3,363 breaches in the fence, and each one costs around $1,300 to repair. That's $4.3 million in repairs. Another is that the new technology being installed to work on the border (sensors, radars and cameras) has either been delayed or doesn't work. (Aircraft maker Boeing has the contract for that and will be paid $1.1 billion for it). That means border agents still uses old equipment that breaks down. Until all that new technology is up and running, there's no way to know whether it works or whether it's cost effective."