US authorities use license plate readers to monitor protestors, activists

US law-enforcement agencies used automated license plate readers (ALPRs) to monitor the movements of protestors and activists, raising concerns about surveillance overreach, civil-rights violations, and transparency failures. What happened Police agencies a cross the US positioned AI-powered ALPR-equipped patrol cars and fixed roadside units near demonstrations, activist meet-ups, and political gatherings, capturing and storing plate numbers, timestamps, and location data of vehicles attending or passing by protests. In Phoenix, Arizona, police used surveillance, including license plate readers and drones, to track leaders of a Black Lives Matter protest for hours, seeking a pretext for arrest. In Texas, police used an ALPR network to search for a vehicle corresponding to a rally highlighting the mental health impact of immigration policies, logging the reason as "protest veh." The data, often including images of the vehicle and sometimes its occupants, is aggregated into massive, searchable databases, sometimes shared with thousands of other agencies, including federal entities like US Customs and Border Protection (CBP) and Immigration and Customs Enforcement (ICE). The incident occurred over several months, often around major protests, and created a detailed map of individuals’ political activities, associations, and movements. The potential harms included chilling effects on free speech and assembly, exposure of vulnerable groups (such as immigrant-rights activists or environmental organisers), risks of data misuse, and long-term retention of sensitive political-activity information in government databases and private vendor systems. Why it happened The incident stemmed from expanding police adoption of ALPR technologies without sufficient oversight, alongside weak transparency around how data was collected, shared, and retained. Many agencies relied on vendor systems that automatically shared data with regional and national networks, and policies governing protest-related scanning were unclear or nonexistent. Limited public accountability, opaque procurement processes, and inadequate guardrails against surveillance of constitutionally protected activities contributed directly to the problem. What it means This incident has severe implications for individuals and the broader democratic society. For activists and protesters: The use of ALPRs against activists undermines the fundamental First Amendment rights essential to a functioning democracy. It represents a significant erosion of digital privacy and normali s es mass surveillance as a standard policing tool. They face the potential for retaliation, harassment, and police scrutiny based on their legal political activities. The knowledge of constant surveillance can make them hesitant to attend meetings, plan demonstrations, or associate with certain groups, suppressing their engagement in democratic action. For the general public: A ll motorists are subjected to mass location tracking, losing their anonymity on public roads. This data can reveal intimate details about their lives, including medical visits, religious affiliations, and political leanings, transforming public space into a monitored environment. System 🤖 Falcon Developer: Flock Safety Country: USA Sector: Govt - police Purpose: M onitor protestors, activists Technology: Automated license plate/number recognition (ALPR/ANPR); Machine learning Issue: Accountability; Human rights/civil liberties ; Privacy; Transparency

Date it happened

2025-01-01

Organisation involved

California Highway Patrol; Homewood Police Department; Lisle Police Department; Tulsa Police Department

Product, system or model

Faclon

This is a record of what was reported, not a finding that anyone broke the law. If it names your organisation and you believe it is wrong, the corrections process is free and open to everyone.