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Walls work and it's been proved over and over across the world.
San Diego Fence Provides Lessons in Border Control
April 6, 2006
https://www.npr.org/templates/story/story.php?storyId=5323928
Before the fence was built, all that separated that stretch of Mexico from California was a single strand of cable that demarcated the international border.
Back then, Border Patrol agent Jim Henry says he was overwhelmed by the stream of immigrants who crossed into the United States illegally just in that sector.
"It was an area that was out of control," Henry says. "There were over 100,000 aliens crossing through this area a year."
Today, Henry is assistant chief of the Border Patrol's San Diego sector. He says apprehensions here are down 95 percent, from 100,000 a year to 5,000 a year, largely because the single strand of cable marking the border was replaced by double -- and in some places, triple -- fencing.
The first fence, 10 feet high, is made of welded metal panels. The second fence, 15 feet high, consists of steel mesh, and the top is angled inward to make it harder to climb over. Finally, in high-traffic areas, there's also a smaller chain-link fence. In between the two main fences is 150 feet of "no man's land," an area that the Border Patrol sweeps with flood lights and trucks, and soon, surveillance cameras.
"Here in San Diego, we have proven that the border infrastructure system does indeed work," Henry says. "It is highly effective."
Urban areas or even near Urban areas do not present the same sorts of border issues that the bulk of our Southern Border presents. Nobody argues that physical barrier in the right places and integrated into a total system makes sense. 1,100 new miles of physical barrier doesn't.