Map of border surveillance towers shows growing 'virtual wall' along U.S. southern border https://www.tucsonsentinel.com/nationworld/report/050123_surveillance_towers/map-border-surveillance-towers-shows-growing-virtual-wall-along-us-southern-border/
U.S. Customs and Border Protection is aggressively expanding a “virtual wall” of border surveillance towers in the Southwest, according to the Electronic Frontier Foundation, which is mapping the locations of each tower along America’s southern border.
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