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The virtual fence was tried in Arizona and was a bust as some of us knew it would be.,/i>
The Yuma section has worked very well.
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"The Department of Homeland Security on Friday canceled a project to build a technology-based “virtual fence” across the Southwest border, saying that the effort — on which $1 billion has already been spent — was ineffective and too costly"
"In a pilot program in Arizona, it cost about $1 billion to build the system across 53 miles of the state’s border"

"Boeing had built a complex system of sensors, radars and cameras mounted on towers that was supposed to lead border agents to the exact location of illegal crossers. But the system functioned inconsistently in the rough terrain along much of the border."