The southern border wall costs a billion US per mile.

There is a problem with this entire idea and I will show exactly what it is. The wall is scalable. The picture below is a section of wall in the Bloomberg article. Ask a simple question. Can a mountain climber armed with a rope and good boots climb that wall? Can that same mountain climber scale the wall without good boots? Does anyone actually believe there is nothing in nature that outclasses the border fence as difficult to scale? That is nothing. Try climbing a glacier with ice edges everywhere.

That fence is nothing to people determined to climb it. There is nothing there that can't be overcome. EASILY OVERCOME. There will never be a fence placed at the USA border that is not scalable. There are even steps that assist them.

IF by some chance there is a section of fence found to be successful, besides the hostile environment it might find itself, the Trumpies in the USA will want to replace the entire length of the border wall with it. The cost of a billion per mile is not simply the miles planned for, but, for the entire length of the USA border to replace fencing determined to be unsuccessful. There is nothing here that spells added security for the southern border.

Prison walls work because there are guards patrolling. If prison fences didn't have guards, the prison would be empty.

U.S. Customs and Border Protection (click here) has put up just 1.7 miles of fencing with the $1.57 billion that Congress appropriated last year for President Donald Trump’s wall along the Mexican border, a federal judge was told.

A lawyer for the U.S. House of Representatives provided the information Tuesday to the judge in Oakland, California, who is weighing requests from 20 state attorneys general and the the Sierra Club to block Trump from using funds not authorized by Congress to build the wall.