
Originally posted on Substack
Yesterday, I edited Chatrie v. United States (2026) for my casebook, INFORMATION PRIVACY LAW, which Paul Schwartz and I are in the process of updating right now. The U.S. Supreme Court held that there is a reasonable expectation of privacy in geolocation data obtained via a geofencing warrant (which compels a company to turn over data about cell phones located in a particular area). This means that the Fourth Amendment applies, which is the first step for Fourth Amendment protection.
Chatrie was decided this week, so the ink is still wet, but here are some early thoughts on the case, plus my edited version. The opinion with concurrences and dissents clocks in at more than 70 pages, but I cut it down to the essentials. First, my thoughts, then the edited case.
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