It's no secret that 2025 has given Americans plenty to protest about. But as news cameras showed protesters filling streets of cities across the country, law enforcement officers—including U.S. Border Patrol agents—were quietly watching those same streets through different lenses: Flock Safety automated license plate readers (ALPRs) that tracked every passing car.
Through an analysis of 10 months of nationwide searches on Flock Safety's servers, we discovered that more than 50 federal, state, and local agencies ran hundreds of searches through Flock's national network of surveillance data in connection with protest activity. In some cases, law enforcement specifically targeted known activist groups, demonstrating how mass surveillance technology increasingly threatens our freedom to demonstrate.
Flock Safety provides ALPR technology to thousands of law enforcement agencies. The company installs cameras throughout their jurisdictions, and these cameras photograph every car that passes, documenting the license plate, color, make, model and other distinguishing characteristics. This data is paired with time and location, and uploaded to a massive searchable database. Flock Safety encourages agencies to share the data they collect broadly with other agencies across the country. It is common for an agency to search thousands of networks nationwide even when they don't have reason to believe a targeted vehicle left the region.
Via public records requests, EFF obtained datasets representing more than 12 million searches logged by more than 3,900 agencies between December 2024 and October 2025. The data shows that agencies logged hundreds of searches related to the 50501 protests in February, the Hands Off protests in April, the No Kings protests in June and October, and other protests in between.
The Tulsa Police Department in Oklahoma was one of the most consistent users of Flock Safety's ALPR system for investigating protests, logging at least 38 such searches. This included running searches that corresponded to a protest against deportation raids in February, a protest at Tulsa City Hall in support of pro-Palestinian activist Mahmoud Khalil in March, and the No Kings protest in June. During the most recent No Kings protests in mid-October, agencies such as the Lisle Police Department in Illinois, the Oro Valley Police Department in Arizona, and the Putnam County (Tenn.) Sheriff's Office all ran protest-related searches.
While EFF and other civil liberties groups argue the law should require a search warrant for such searches, police are simply prompted to enter text into a "reason" field in the Flock Safety system. Usually this is only a few words–or even just one.
In these cases, that word was often just “protest.”
Crime does sometimes occur at protests, whether that's property damage, pick-pocketing, or clashes between groups on opposite sides of a protest. Some of these searches may have been tied to an actual crime that occurred, even though in most cases officers did not articulate a criminal offense when running the search. But the truth is, the only reason an officer is able to even search for a suspect at a protest is because ALPRs collected data on every single person who attended the protest.
Search and Dissent
2025 was an unprecedented year of street action. In June and again in October, thousands across the country mobilized under the banner of the “No Kings” movement—marches against government overreach, surveillance, and corporate power. By some estimates, the October demonstrations ranked among the largest single-day protests in U.S. history, filling the streets from Washington, D.C., to Portland, OR.
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