TL;DR: Automated License Plate Readers (ALPRs) photograph and log the location of every vehicle they see, not just suspects. Flock Safety alone operates nearly 90,000 cameras across 7,000 networks, scanning 20 billion plates monthly. Private databases like Vigilant Solutions' DRN hold 9+ billion historical records. More than 75% of law enforcement agencies using Flock share data to a live national database accessible without warrants. Only 0.5% of scanned plates match crime hotlists, the other 99.5% are innocent people whose movements are logged anyway. Your car is a tracking device whether you realize it or not.
What Are Automated License Plate Readers?
ALPRs are high-speed cameras combined with optical character recognition (OCR) software. They photograph license plates, convert the image to text, log the time and GPS coordinates, and check against databases, all in milliseconds [1].
Where they're installed:
- Police vehicles (mobile ALPR)
- Fixed poles at intersections and highways
- Toll booths and bridges
- Parking garages and lots
- Private property (HOA entrances, apartment complexes)
- Repo trucks and commercial vehicles
What they capture:
- License plate number
- Exact GPS coordinates
- Date and timestamp
- Direction of travel
- Photo of the vehicle (sometimes including occupants)
- Vehicle make, model, and color
The technology has been part of law enforcement's toolkit for over two decades. What's changed is the scale, and who has access to the data.
The Scale of Vehicle Surveillance
Flock Safety (as of July 2025):
- Nearly 90,000 cameras deployed nationwide
- 7,000 networks across 49 states
- 20 billion vehicle scans per month
- 5,000+ law enforcement departments using the system
- 800 U.S. cities voted to pass Flock contracts in 2025 alone
- 75%+ of departments share data to Flock's live national database [2]
Vigilant Solutions / DRN (Motorola):
- 9+ billion license plate scans in the database
- 5+ billion law enforcement-accessible records
- Data from 173+ agencies across 23 states
- 2.5 billion scans logged in 2016-2017 alone
- Average agency shares with 160 other agencies [3]
The market: ALPR market size hit $573.7 million in 2020, projected to reach $641.7 million by 2026, and those projections are likely conservative given the 2025 expansion [4].
There are 250+ million vehicles on U.S. roads. The goal of these systems isn't to track suspects. It's to track everyone, then search later.
Who Collects This Data?
Law enforcement: Police departments operate their own ALPR fleets and access shared databases. 100% of police departments serving 1+ million residents use ALPRs. Nearly 90% of sheriffs' offices with 500+ deputies use them [5].
Private companies: The largest databases are privately owned. Vigilant Solutions' Digital Recognition Network (DRN) is essentially crowdsourced, hundreds of repo men install cameras in their vehicles. As they drive around looking for cars to repossess, they passively record every plate they pass and upload to the company's database [3].
Private citizens and HOAs: Flock cameras are installed at neighborhood entrances, apartment complexes, and business parks. Anyone driving through has their plate logged. Residents often have no say in whether cameras are installed.
Commercial entities: Shopping centers, parking operators, and toll systems maintain their own ALPR databases. This data can be sold or shared with law enforcement.
Federal agencies: ICE and CBP have purchased access to commercial ALPR databases. CBP bought access to a "nationwide vehicle tracking database" that covers every state except Hawaii [3].
The Data Sharing Network
The real power isn't individual cameras. It's the interconnected network.
Flock's national database:
- More than 75% of Flock police customers opt in to share data nationally
- Any participating agency can query the entire network
- No warrant required to search
- Access to license plate numbers, locations, directions, and timestamps [2]
Vigilant's LEARN network:
- Law Enforcement Archival Reporting Network
- Police departments can automatically share reads with partner agencies
- Cross-agency queries possible without formal requests
- Includes commercial data from repo companies [3]
The result: A police officer in rural Texas can query where your car has been seen across the entire country, often including private parking lots, neighborhood entrances, and public streets, without any judicial oversight.
Beyond Crime Fighting
Only 0.5% of license plates captured by ALPR are connected to a public safety interest at the time they're captured. That means 99.5% of scans capture innocent people's movements [3].
How this data has been used:
Protest surveillance: EFF obtained data showing more than 50 federal, state, and local agencies ran hundreds of searches through Flock's national network in connection with protest activity between December 2024 and October 2025 [2].
Immigration enforcement: At least eight Washington state law enforcement agencies enabled sharing of Flock data with Border Patrol during 2025. In May 2025, Flock data was queried for use in immigration enforcement nationwide [6].
Reproductive healthcare tracking: ALPRs at state borders can log vehicles traveling to states with different abortion laws. There's no technical barrier to tracking who visits reproductive healthcare facilities.
Sensitive location tracking: ALPR data reveals who visits health centers, immigration clinics, gun shops, union halls, religious centers, and political events. Even if you're not doing anything wrong, this data exists and can be accessed [1].
Vehicle OSINT Beyond ALPR
License plates are just one vector. Here's what else can be discovered about a vehicle:
VIN (Vehicle Identification Number):
- 17-character unique identifier visible on dashboard and door frame
- Reveals manufacturer, model, year, production plant
- Links to accident history, title transfers, recall data
- Previous owner count (not names, due to DPPA protections)
- Services like Carfax, AutoCheck compile comprehensive histories [7]
DMV records:
- Driver's Privacy Protection Act (DPPA) restricts access
- Law enforcement, insurance companies, and licensed investigators can request owner information
- States vary in how strictly they enforce DPPA
- Some states have "opt-in" provisions that allow broader sharing [7]
Toll records:
- E-ZPass and similar systems log every toll crossing
- Subpoenaable in legal proceedings
- Can establish presence at specific locations with timestamps
Parking systems:
- Many parking garages use ALPR for ticketless entry
- Creates timestamped entry/exit records
- Data retention policies vary widely
OSINT tools: Collections like GitHub's Vehicle-OSINT-Collection and commercial platforms aggregate multiple data sources, license plate lookups, VIN decoders, registration databases, and insurance records [7].
Why This Matters
No opt-out exists. Vehicle owners cannot prevent ALPR collection. You cannot ask to be removed from DRN's database. You cannot opt out of Flock's network. Driving on public roads, or through private property with cameras, means your location is logged [3].
Data breaches happen. Even Customs & Border Protection saw its ALPR vendor, Perceptics, hacked and data published online. These databases are high-value targets [1].
Mission creep is inevitable. Systems deployed for "finding stolen cars" expand to tracking protesters, immigrants, and political opponents. The infrastructure exists; only policy prevents misuse, and policy changes.
Aggregate data reveals everything. Individual plate reads seem harmless. Aggregate data over weeks or months reveals where you work, where you worship, who you visit, what doctors you see, and what your daily patterns are [1].
Community Pushback
Resistance to ALPR expansion is growing:
Eugene and Springfield, Oregon: Both cities signed Flock contracts in early 2025. Eleven months later, both cities and Lane County ended their contracts with the company [8].
Evanston, Illinois: In August 2025, 19 Flock Safety cameras were deactivated following community opposition.
Multi-state activism: NBC News documented activists and local politicians pushing back against Flock in seven states, Arizona, Colorado, New York, Oregon, Tennessee, Texas, and Virginia [2].
Legal victories: In November 2025, a Washington court ruled that data captured on Flock Safety cameras are public records, meaning the public can request information about what's being captured in their communities [9].
Anti-surveillance mapping: An activist created a map of Flock camera locations. Flock sent a cease and desist letter, which EFF reported the mapmaker refused [10].
See: Communities Winning Against ALPR Surveillance for detailed case studies.
Legal Protections (Limited)
State laws: At least 16 states have passed laws regulating ALPR use. Requirements vary widely:
- Some prohibit ALPRs except for specific public safety purposes
- Some require privacy policies and data retention limits
- Some mandate audits of who accesses the data
- Few have meaningful enforcement mechanisms [1]
No federal regulation: There's no comprehensive federal law governing ALPR use. The DPPA protects DMV records but doesn't cover ALPR databases.
Fourth Amendment limitations: Courts have generally held that license plates visible in public spaces don't have a reasonable expectation of privacy. The aggregate tracking enabled by ALPR networks hasn't been definitively addressed by the Supreme Court.
What good policy would look like:
- Immediate deletion when a plate doesn't match a hotlist
- Warrants required for historical location data
- Strict limits on data sharing between agencies
- Prohibition on immigration enforcement access
- Public transparency about camera locations and query frequency
Countermeasures (Limited)
There's no reliable way to avoid ALPR tracking while driving your own registered vehicle. That said:
What people try:
- IR-blocking films/coatings: Absorb infrared light used by some ALPRs. Problem: many systems switch to visible light during daytime
- Reflective films: Reflect light to make plates unreadable. Problem: may be illegal in your jurisdiction
- Physical covers: Obscure plates from angles. Problem: definitely illegal in most jurisdictions
Legal considerations: Obscuring, covering, or altering your license plate is illegal in most states. Products marketed as "ALPR blockers" may result in traffic stops and fines.
Alternative approaches:
- Car sharing: Using services like Zipcar obscures which individual drove. The service still has booking data, but your plate isn't tracked
- Public transit: Reduces vehicle tracking (but introduces transit payment tracking)
- Advocacy: Push for local ordinances banning or restricting ALPR deployment
- Awareness: Know where cameras are deployed in your area
- FOIA requests: Request ALPR data from your local police to see what's being collected
The honest answer: if you drive a registered vehicle, you're being tracked. The question is how that data is used and who has access.
The Bottom Line
Your car is a surveillance device, not because of technology you installed, but because of infrastructure built around you.
The numbers:
- 20 billion plates scanned monthly by one company alone
- 9+ billion historical records in private databases
- 90,000+ cameras in 7,000 networks
- 99.5% of scans are innocent people
- 75%+ of police share to national databases without warrants
ALPR was sold as a tool to find stolen cars and wanted criminals. It became a mass surveillance system that logs where every vehicle goes, stores that data for years, and shares it across thousands of agencies with minimal oversight.
The infrastructure is built. The cameras are deployed. The question now is whether any limits will be placed on how this data is used, or whether detailed movement records of 250+ million vehicles simply become another resource available to anyone with access.
Your movements are being logged. The only open question is what happens with that data.
References
- EFF Street Level Surveillance, Automated License Plate Readers
- EFF, How Cops Are Using Flock Safety's ALPR Network to Surveil Protesters
- EFF, Data Driven: What We Learned About ALPR
- DHS, Automated License Plate Readers Market Survey Report (June 2025)
- Congressional Research Service, Law Enforcement and Technology: Use of ALPRs
- UW Center for Human Rights, Flock Surveillance Systems Expose Washington Data to Immigration Enforcement
- GitHub, Vehicle OSINT Collection
- Lookout, Timeline: Flock Cameras in Eugene-Springfield
- EFF, Washington Court Rules Flock Data Are Public Records
- EFF, Anti-Surveillance Mapmaker Refuses Flock Safety's Cease and Desist
- Brennan Center, Automatic License Plate Readers: Legal Status and Policy Recommendations
- Vice, CBP Bought Access to Nationwide Car Tracking System