Funding for US Border Patrol doubled in the decade between 2015 and 2025, allowing the government to spend lavishly on technologies to thwart illegal crossings at the US-Mexico border. Customs and Border Protection (CBP) investments already include surveillance towers that can monitor several miles, military-style drones, and even robot dogs with guns mounted to their backs — and the agency is set to receive $51.6 billion this year for border infrastructure alone, more than double its entire budget in 2024. Reporting from the US-Mexico border in 2022 and 2023, the Electronic Frontier Foundation identified more than 14 types of technology currently in use to surveil American citizens and migrants alike.