The basics
What is Flock, and why is it on your street?
A plain-language explainer of the largest license-plate surveillance network in the country: who builds it, who buys it, what it records, and what has already gone wrong.
The company
Flock Safety is a private company founded in 2017 that sells automated license-plate readers, usually shortened to ALPRs. Its customers are police departments, sheriff's offices, homeowners associations, schools, and businesses. The cameras are small, solar-powered, and cheap to install, which is why they spread so quickly: by the mid-2020s Flock claimed thousands of communities across most U.S. states.
What the cameras record
Each camera photographs every vehicle that passes it. Software reads the plate and also logs what Flock calls a "vehicle fingerprint": make, body type, color, and details like roof racks, bumper stickers, and damage. Every record carries a timestamp and location, and is typically stored for 30 days.
The important part is who gets recorded: everyone. ALPRs do not wait for a stolen-car report to start photographing. Your trips to work, to a clinic, to a church, to a protest, or to a friend's house are all captured if a camera sits on the route, and they stay searchable for a month.
The network is the product
A single camera is a local record. Flock's pitch to police is the network: agencies can opt into sharing, which lets a detective in one state sweep cameras across thousands of towns in a single search. That is also the core of the problem. Your town's rules about how its cameras get used stop mattering the moment an agency somewhere else runs a nationwide search that includes your town's data.
What has already gone wrong
None of this is hypothetical. A pattern has been documented by reporters and confirmed by audit logs obtained through public-records requests:
- Officers stalking people they know. Police in multiple states have been fired, charged, or forced to resign after using Flock searches to track ex-partners and other people with no connection to any case.
- Searches crossing state lines for things that are legal where the person lives. In one widely reported case, a Texas sheriff's office searched cameras in dozens of states looking for a woman connected to an abortion, in states where her care was fully legal.
- Federal immigration enforcement using local cameras. Audit logs have shown local police running Flock searches on behalf of federal immigration agencies, in some cases violating state law, which has triggered state audits and investigations.
- Constitutional challenges. Civil-liberties lawyers argue that continuously photographing every driver amounts to warrantless tracking, and Fourth Amendment lawsuits are moving through the courts now.
Our news page pulls the latest reporting on all of this automatically, several times a day.
What the sales pitch leaves out
Flock markets the cameras with recovered stolen cars and solved cases, and those cases are real. Here is what the pitch usually skips: the vast majority of plates photographed belong to people who are suspected of nothing; hit rates are a tiny fraction of reads; the data can be searched by thousands of outside agencies; the cameras keep billing your town roughly $3,000 apiece every year; and independent research has not shown that ALPR networks reduce crime overall. A council member who hears both halves of that story often votes differently.
Learn more from the people tracking this
- EFF's Street-Level Surveillance guide to ALPRs, the clearest technical explainer.
- The Atlas of Surveillance, a searchable database of which agencies use which surveillance tech.
- DeFlock, the volunteer project mapping camera locations worldwide.
- The ACLU's privacy and technology work, including model local ordinances.