A simple technology could secure the border for a fraction of the cost of a wall — but no one's talking about it

Roughly 10 years ago, a bizarre parade of animals, people, and vehicles lined up in the middle of the Sonoran Desert to trot, walk, and drive over a 100-foot cable stretched out across the dirt by a team of scientists. By the University of Arizona researchers' accounts, the experiment was a resounding success, heralding a new frontier in border-security technology.
Read more: https://www.businessinsider.com/fiber-optic-sensing-technology-vs-border-wall-2019-2?source=Snapzu