Thanks anon, I found it, interesting stuff. What they need is tech that will detect tunnels. My gut tells me that more illegals flood through the underground tunnels than over land.
They have hundreds of tunnels that go undetected. The lead right up and into warehouses along the border where the illegals load into nondescript vans where they can be transported anywhere into the country. They make more moving people underground below our border than they do on drugs. We need some deep ground penetrating radar on the border right away.