New map shows expansion of surveillance towers along southern US border

AI-enhanced cameras can detect objects of interest' miles away, but critics say they will drive migrants deeper into dangerous desert

A new map detailing the location of hundreds of surveillance towers is providing the most comprehensive public look yet at the growing virtual wall at the United States' southern border.

The map, published this month by the Electronic Frontier Foundation, a nonprofit focused on digital privacy, free speech and innovation, tallies more than 300 existing and 50 proposed surveillance towers along the US-Mexico border.