"One of the most pervasive arguments against a border fence is the puerile nursery chant, “show me a 20-foot fence, I’ll show you a 21-foot ladder.” [...] The problem is they can’t show us the 21-foot ladder."
"Congress passed a bill in 1996 to require construction of a double-layered fence (triple-layer in some places) in the San Diego corridor along the coast. You can see a picture of the fence with razor wire here. By the end of the decade, apprehensions fell by 95% as illegals moved eastward, even though the fence covered only 14 miles of the 60-mile sector. "
"The 245-mile security fence in Israel cost $450 million, averaging $1.8 million per mile. Assuming the completion of our security fence would cost the same amount, the total tab would come in at just under $2 billion."
"According to a conservative estimate by Robert Rector of the Heritage Foundation, for every illegal alien that returns home (or is prevented from crossing the border), taxpayers save $700,000. That means we would reach the break-even point after preventing just the first 8,500 illegal immigrants from crossing."
https://www.conservativereview.com/Commentary/2015/08/Border-Fences-Work