Contractors must meet several requirements while building these prototypes. The structures
must be anti-breaching, anti-climbing, anti-digging and safe for Border Patrol agents to patrol.
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Are the walls proposed to be built on the border line or some distance inland? I still don’t
see how the illegals couldn’t build a scaffold or ladder like device on the Mexico side which
they could scale and then drop down via a rope, etc.
“I still don’t see how the illegals couldn’t build a scaffold or ladder like device on the Mexico side”
As that becomes a bigger job, it takes longer, allowing more time for detection and interdiction.
That is the essential calculus of the defensive fortification.
As the barrier gets tougher, the number of folks attempting to breach also goes down, and you get to focus your same forces against fewer targets. Barriers are force multipliers.
An effective barrier system will include multiple barriers (like a wall and a fence or two) with an exclusion area in between, that is wired with sensors, alarms and cameras, and has all-weather (paved) roads for quick response. That is what is planned in most cases for Trump’s wall.
Once banditos are inside the exclusion area, the cops are on the way. Even if they can breach the wall using fit young men with specialized climbing gear, they are much more likely to be arrested on the US side.
Building scaffolding or ramps is prohibitively difficult over a 30 foot wall with 100 feet of standoff exclusion area, with the cops on the way.
Once the big infrastructure is laid in (Wall, exclusion area, roads, utility conduit) it is quick and cheap to strap on additional features, like razor wire, new sensors, or aerial drone patrols/response, as new breaching techniques are tried by the cartels.
The great bulk of illegal immigrants and petty criminals however, will be decisively deterred by a barrier like the one planned. The border area of San Diego was a slum, before a decent 18 foot fence was put in - now it is safe and expensive real estate.