How we made the first comprehensive map of deaths along the US border's "virtual wall"

How we made the first comprehensive map of deaths along the US border's "virtual wall" We analyzed whether nearly 4,000 migrant deaths occurred within sight of the US government's surveillance towers. Our investigation found people dying near border surveillance towers that promised faster responses to crossings. Our 15-month investigation into death and surveillance along the US-Mexico border began with a simple question: Why did so many people die near government surveillance towers meant to help track and apprehend them? This story is part of Dying on Camera, a collaboration between and . To answer that question, we looked through thousands of pages of government documents, visited the border multiple times, and interviewed more than 45 people, including current and former White House advisors, presidential appointees, Border Patrol agents, medical examiners, sheriffs, humanitarian volunteers, and employees of tech companies. The result of our investigation is the first comprehensive map and analysis of deaths near border surveillance towers. Here's how we built it, what decisions we made along the way, and what the data can and can't tell us. The investigation relied on knowing where migrants have died and where and when US Customs and Border Protection towers were installed.