San Diego Fence Provides Lessons in Border Control
https://www.npr.org/templates/story/story.php?storyId=5323928
"Here in San Diego, we have proven that the border infrastructure system does indeed work," Henry says. "It is highly effective."
Secure Fence Act of 2006
https://en.wikipedia.org/wiki/Secure_Fence_Act_of_200
In 2006, at the time it was passed, George W. Bush's White House touted the fence as "an important step toward immigration reform."[1] The White House Office of the Press Secretary stated that the Act "Authorizes the construction of hundreds of miles of additional fencing along our Southern border; Authorizes more vehicle barriers, checkpoints, and lighting to help prevent people from entering our country illegally; Authorizes the Department of Homeland Security to increase the use of advanced technology like cameras, satellites, and unmanned aerial vehicles to reinforce our infrastructure at the border."[1]
Where U.S.-Mexico border fence is tall, border crossings fall
https://www.csmonitor.com/USA/2008/0401/p01s05-usgn.html
"This wall works," says Mr. Bernacke. "A lot of people have the misconception that it is a waste of time and money, but the numbers of apprehensions show that it works."