BALTIMORE · AIR PROGRAM · FOURTH AMENDMENT

A federal appeals court held Baltimore's renewed persistent aerial surveillance program unconstitutional.

Citywide daytime movement record → six-month pilot → en banc Fourth Circuit blocks access to collected data

Baltimore revived its aerial-surveillance partnership in 2020 as the Aerial Investigation Research program. Camera-equipped aircraft were designed to fly over the city during daylight hours and build a slow-frame-rate record that investigators could use to reconstruct movements after a crime occurred.

In Leaders of a Beautiful Struggle v. Baltimore Police Department, the U.S. Court of Appeals for the Fourth Circuit, sitting en banc, held in 2021 that the program violated the Fourth Amendment. The court focused on the ability to aggregate movements across time rather than treating each individual moment outdoors as isolated public observation.

The pilot had already ended by the time of the en banc ruling, but Baltimore still possessed collected data. The court's decision prevented police from continuing to access the unlawfully acquired archive.

Why it matters: Being visible at one moment is not the same as giving the government a rewindable history of your movements. Persistence changes the constitutional and practical character of observation.

Court / primary sources: Fourth Circuit — Leaders of a Beautiful Struggle v. BPD · ACLU case summary

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