Leaders of a Beautiful Struggle v. Baltimore Police Department (U.S. Court of Appeals for the Fourth Circuit (en banc), June 24, 2021)

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The Fourth Circuit, en banc, ruled Baltimore's 'Aerial Investigation Research' program — run by private contractor Persistent Surveillance Systems, whose camera planes captured ~12 hours/day of movement across ~90% of the city — an unconstitutional warrantless search under Carpenter v. U.S., likening it to putting 'an ankle monitor on every person in the city.' A settlement bars Baltimore from running a similar program.