Border’s ‘Virtual Wall’ Expands as Deaths Expose Its Blind Spots
Border’s ‘Virtual Wall’ Expands as Deaths Expose Its Blind Spots
For years, the U.S. has built a “virtual wall” of cameras, sensors and AI-enabled surveillance towers along the Mexican border, presenting the network as a high-tech answer to illegal crossings. But an MIT Technology Review and Times of San Diego investigation says the system has also left a grim trail of unanswered questions: people walked through monitored areas, died nearby, and in some cases remained undiscovered for weeks or months.
The reporters mapped nearly 600 towers using nonprofit mapping work and satellite imagery, because Customs and Border Protection does not publish a complete map of the network. Their count found more than 1,050 deaths near towers—an acknowledged undercount, given that the government says roughly 800 towers are operating and death records are fragmented.
The investigation identified failures at several points in the chain: towers that were broken, algorithms that did not detect people, and agents who did not respond to alerts. In one New Mexico stretch near state Representative Sarah Silva’s district, more than 18 people died near surveillance towers in 2024 alone. Her response was blunt: “If I were the federal government, I would do an audit, because this feels like it’s not working.”
That audit has not happened, according to the reporting. Although CBP has had the ability to compare tower activity with nearby deaths since at least 2015, sources said the agency has never conducted a comprehensive review. The stakes are rising: the United States is expected to spend $1 billion to triple the virtual wall by 2034.
Watchdogs have also flagged the data problem. The Government Accountability Office found gaps in Border Patrol’s death-tracking system and later said the Missing Migrant Program lacked a plan to measure whether its data-driven efforts were actually increasing rescues or reducing deaths. Earlier efforts to log technology-assisted apprehensions also produced unreliable records; one former CBP official dismissed the mandate as “spitting in the wind, to be honest.”
The investigation’s prescription is practical but politically pointed: audit deaths near towers, repair migrant-death records, measure whether surveillance produces apprehensions, and automatically investigate deaths within surveillance range before footage—typically deleted after 30 days—is lost.
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