In August 2016, a Bloomberg report revealed a secret aerial surveillance program in Baltimore led by the city’s police department. Over eight months, planes equipped with cameras collected over 300 hours of footage, used by the police to investigate alleged crimes. Hardly anyone outside police department leadership and the vendor, Persistent Surveillance Systems, knew.

Baltimore’s police commissioner at the time, Kevin Davis, defended both the planes and the secrecy. The city’s murder rate was spiking, the stretched police department was responding to thousands of calls per day, and footage from the planes was helping police find suspects.

The planes were grounded amid backlash from residents and civil liberties groups, who called for the immediate suspension of the program and details on what data the city had been collecting. Commissioner Davis was eventually fired after failing to curb the city’s homicide rate. His replacement, Darryl De Sousa, resigned in a tax evasion scandal. The next year, Mayor Catherine Pugh resigned in a separate financial scandal.

Four years later, the planes were back in the air, but under different circumstances. In 2019, Persistent Surveillance Systems CEO Ross McNutt pitched the city on restarting the program. By flying over a 32-square-mile portion of the city, the planes could monitor the city’s most troubled areas, the sites of 80 percent of the city’s gun homicides. Funded entirely by donors, McNutt pitched the planes as an inexpensive but game-changing tool to curb the rising murder rate.

The new program, dubbed Aerial Investigation Research (AIR), underwent public comment and found robust support among the city’s Black and religious communities. The city’s Board of Estimates approved it in April by a vote of 3 to 2. The planes began flying in May for a six-month pilot that ended in October.

The current police commissioner, Michael Harrison, supports the program. “If it doesn’t work, you have my commitment that we will ground the planes,” Harrison said at the April Board of Estimates meeting.

Some activists, including the ACLU, still oppose the program. They say the transparency is immaterial as the planes are inherently invasive and unconstitutional. “The problem with what happened in 2016 wasn’t that it was done in secret, it was that it was done at all,” says David Rocah, senior staff attorney at the ACLU Maryland.

The reemergence of Baltimore’s aerial surveillance program comes at a moment of increasing scrutiny on policing. Local governments are restricting police technology. City leaders in San Francisco, Oakland, and Boston approved restrictions on police use of facial recognition as major vendors like Amazon and Microsoft placed temporary moratoriums on sales of the tech to police. California has passed two privacy laws in the past two years, while Michigan voters endorsed new rules around police access to suspect data.

Baltimore’s increasing murder rate, however, marks the city as an outlier. Residents have long complained of a complicated cycle of violence in the city. Robust police responses can trigger violent backlashes, while passive approaches frustrate residents, who feel ignored. The revolving door of police commissioners has contributed to a lack of trust in police, which frustrates authorities, who complain they can’t solve crimes without the help from potential witnesses. These same witnesses feel police are powerless to protect them from retribution. All the while, murder rises.