The Department of Homeland Security is spending hundreds of millions of dollars on tools that give federal agents easy access to personal data and whereabouts of millions of people. <a href="https://www.wsj.com/news/author/hannah-critchfield?mod=WSJ_TNBPOD">WSJ investigative reporter Hannah Critchfield</a> explains the latest on the technology, and how it’s being deployed. Plus, <a href="https://www.wsj.com/news/author/james-romoser?mod=WSJ_TNBPOD">WSJ Supreme Court reporter James Romoser</a> joins to break down the battle over whether <a href="https://www.wsj.com/us-news/law/police-geofence-warrants-phone-location-17d7cbe4?mod=WSJ_TNBPOD">geofence warrants</a> are an unconstitutional invasion of privacy.

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