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While scouring the Sonoran Desert for objects left behind by migrants crossing into the United States, anthropologist Jason De Le\\xf3n happened upon something he didn\'t expect to get left behind: a human arm, stripped of flesh.

This macabre discovery sent him reeling, needing to know what exactly happened to the body, and how many migrants die that way in the wilderness. In researching border-crosser deaths in the Arizona desert, he noticed something surprising. Sometime in the late-1990s, the number of migrant deaths shot up dramatically and have stayed high since. Jason traced this increase to a Border Patrol policy still in effect, called \\u201cPrevention Through Deterrence.\\u201d

In a series first aired back in 2018, over three episodes, Radiolab investigates this policy, its surprising origins, and the people whose lives were changed forever because of it.Part 1: Hole in the FenceWe begin one afternoon in May 1992, when a student named Albert stumbled in late for history class at Bowie High School in El Paso, Texas. His excuse: Border Patrol. Soon more stories of students getting stopped and harassed by Border Patrol started pouring in. So begins the unlikely story of how a handful of Mexican-American high schoolers in one of the poorest neighborhoods in the country stood up to what is today the country\\u2019s largest federal law enforcement agency. They had no way of knowing at the time, but what would follow was a chain of events that would drastically change the US-Mexico border.

Special thanks to Centro de Salud Familiar La Fe, Estela Reyes L\\xf3pez, Barbara Hines, Lynn M. Morgan, Mallory Falk, Francesca Begos and Nancy Wiese from Hachette Book Group, Professor Michael Olivas at the University of Houston Law Center, and Josiah McC. Heyman at the Center for Interamerican and Border Studies.

EPISODE CREDITS:\\xa0

Reported by - Latif Nasser, Tracie HunteProduced by - Matt Kieltywith help from - Bethel Habte, Tracie Hunte, Latif NasserCITATIONSBooks:Jason De L\\xe9on\\u2019s book The Land of Open Graves (https://zpr.io/vZbTarDzGQWK)\\xa0Timothy Dunn\\u2019s book Blockading the Border and Human Rights (https://zpr.io/VTPWNJPusaCn)Joseph Nevin\'s book, Operation Gatekeeper (https://zpr.io/UTnHFzRstAEw)Articles:Rubio-Goldsmith, Raquel, Melissa McCormick, Daniel Martinez, and Inez Duarte. 2006. \\u201cThe \\u2018Funnel Effect\\u2019 & Recovered Bodies of Unauthorized Migrants Processed by the Pima County Office of the Medical Examiner, 1990-2005.\\u201d SSRN Electronic Journal. (https://zpr.io/R3wSpyVCXQhJ)Our newsletter comes out every Wednesday. It includes short essays, recommendations, and details about other ways to interact with the show. Sign up (https://radiolab.org/newsletter)!

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Leadership support for Radiolab\\u2019s science programming is provided by the Gordon and Betty Moore Foundation, Science Sandbox, a Simons Foundation Initiative, and the John Templeton Foundation. Foundational support for Radiolab was provided by the Alfred P. Sloan Foundation.