The Geofence Warrant Privacy Battle

Modern smartphones are no longer mere accessories; they have become, as the Supreme Court observed a decade ago in Riley, an "important feature of human anatomy." But this digital limb does more than connect us to the internet—it serves as a high-resolution, timestamped tracker of our most private associations. For years, law enforcement has exploited this by deploying "geofence warrants," a digital dragnet that compels companies like Google to scour their "Sensorvault" databases to identify every device within a specific radius at a specific time.

The legal battle over this virtual panopticon reached its zenith in the case of Okello Chatrie. Investigating a 2019 bank robbery in Midlothian, Virginia, police used a three-step geofence warrant to identify anyone near the crime scene. The search eventually snared Chatrie, whose phone had entered the "fence" ten minutes before the robbery. Chatrie’s defense team sparked a fundamental constitutional showdown:

Can the Fourth Amendment’s shield against "unreasonable searches" survive in an era of near-perfect digital tracking?

Chatrie v. United States.

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