License plate readers are in use across most U.S. states, but the rules about how they work and what happens to the data vary widely

License plate readers are cameras that automatically photograph vehicle plates and convert them to searchable text. Most states have them now — typically mounted on police cars, traffic cameras, or fixed locations like highway overpasses. But "most states have them" does not mean they all use them the same way. Some states require police to delete the photos after a set time. Others keep them indefinitely. Some states let private companies operate readers. Others restrict them to law enforcement only. A few states have passed laws limiting how police can use the data.

The core technology is the same everywhere: the camera captures the plate, software reads it, and the system checks it against databases of stolen vehicles, wanted suspects, or unpaid tolls. What differs is what happens to that photo and data after the check is done — and whether you have any way to know your plate was scanned.

Key Takeaways

  • License plate readers operate in most states, but data retention rules and restrictions on use differ significantly from state to state.
  • Some states require police to delete photos within days or months; others keep them for years or indefinitely.
  • A handful of states have passed laws limiting police use of readers or requiring transparency about where they are deployed.
  • Private companies operate readers in some states for tolling, parking enforcement, or repo work, with minimal oversight in most places.
  • You cannot currently request to see if your plate was scanned in most states, though a few are moving toward transparency requirements.

States with strict data deletion policies

A small group of states have passed laws requiring police to delete license plate reader photos after a specific time period. Vermont requires deletion within 30 days unless the plate is flagged as stolen or connected to a crime. New Hampshire requires deletion within 90 days. Maine requires deletion within 60 days. Colorado requires deletion within 90 days unless there is an active investigation.

These states are the exception. Most states have no legal requirement to delete the photos at all, which means some police departments keep them for years. Even in states with deletion rules, the law typically allows police to keep photos longer if the plate matched a wanted vehicle or suspect — so the deletion timeline does not apply to every scan.

A few other states have passed weaker versions of these rules. Utah requires police to have a written policy about data retention, but does not mandate deletion. Tennessee requires deletion of photos that do not match a wanted vehicle, but the timeline is set by individual police departments, not state law.

States that restrict police use of readers

California requires police to document every search of license plate reader data and report the results to the state attorney general. The law also requires police to delete photos within 60 days unless they are part of an active investigation. Illinois requires police to have a warrant or court order to search the database, with narrow exceptions for stolen vehicles and missing persons.

New York requires police to document their searches and restricts use to specific purposes: stolen vehicles, missing persons, and vehicles connected to serious crimes. Virginia restricts use to stolen vehicles and missing persons. Florida requires police to have reasonable suspicion before searching the database.

These restrictions exist because of privacy concerns raised by civil rights groups and transparency advocates. Even with these rules in place, enforcement varies. A police department with a written policy is not the same as a police department that follows it, and oversight is often limited.

States with minimal restrictions or unclear policies

The majority of states have no statewide law governing license plate readers. This means individual police departments set their own rules — or have no rules at all. Texas, Ohio, Pennsylvania, North Carolina, Georgia, Arizona, and Washington all have readers in use but no statewide data retention or use restrictions. Police departments in these states may keep photos indefinitely, and there is no requirement to document searches or limit use to specific purposes.

In states without statewide rules, some large police departments have adopted their own policies — often because of local pressure or lawsuits — but smaller departments may not have any formal guidelines. This creates a patchwork where your privacy protections depend on which police department scans your plate.

A few states have passed laws that actually encourage reader use. Louisiana and Mississippi have passed laws that make it easier for police to use readers and harder for the public to challenge their use in court.

Private company use of license plate readers

License plate readers are not limited to police. Private companies operate readers for tolling systems, parking enforcement, and vehicle repossession. Tolling companies in states like Florida, Texas, Illinois, and New York use readers to photograph plates and bill vehicle owners. Parking enforcement companies use readers to find vehicles with unpaid tickets or expired permits. Repossession companies use readers to locate financed vehicles.

Private reader data is subject to different rules than police data — usually governed by contracts between the company and the state or city, not by privacy law. In most cases, there is no requirement to delete the data, and the company can use it for purposes beyond what the contract specifies. Some states have started to regulate private readers, but most have not.

If you have unpaid tolls or parking tickets, a private company's reader may have already photographed your plate. Unlike police data, you typically cannot request to see this information or challenge its accuracy through a public records request.

How to find out your state's specific rules

Your state's rules may have changed recently, and local police departments may have policies that differ from state law. The best way to find current information is to contact your state's attorney general office or your local police department's public information officer and ask: Does your department use license plate readers? How long are photos retained? What are the rules for searching the database? Are there any restrictions on what the data can be used for?

Some states publish this information online. California publishes an annual report on license plate reader use. New York publishes policies on its attorney general website. Most states do not publish this information, so you may need to file a public records request to get answers.

Civil rights organizations including the Electronic Frontier Foundation and the American Civil Liberties Union maintain databases of state and local reader policies. These are not always current, but they can give you a starting point for what to ask your local police department.

What happens when your plate is scanned

When a license plate reader scans your plate, the system checks it against databases of stolen vehicles, wanted suspects, and — in some cases — vehicles with unpaid tolls or parking tickets. If there is a match, police or a private company may be notified. If there is no match, what happens to the photo depends on your state's rules and the police department's policy.

In states with deletion requirements, the photo should be deleted within the required timeframe. In states without requirements, the photo may be kept indefinitely. You have no way to know whether your plate was scanned, whether it matched anything, or whether the photo is still in a database somewhere. A few states are moving toward transparency requirements that would let you request this information, but most do not offer this option yet.

If you believe your plate was scanned in error or your data was misused, your options are limited. You can file a complaint with your local police department or state attorney general, but there is no may provide of action. In some states, you can sue if your rights were violated, but this requires hiring a lawyer and proving damages.

Frequently Asked Questions

Can I request to see if my license plate was scanned?

In most states, no. You cannot request this information through a public records request because the data is considered part of an active law enforcement database. A few states including California are moving toward transparency requirements, but these are still rare. Your best option is to contact your state attorney general and ask whether your state has a transparency law or is considering one.

Do I have to pay a fine if a reader scans my plate?

Only if your plate matched something in a database — a stolen vehicle, a wanted suspect, or unpaid tolls or parking tickets. A routine scan with no match does not result in any fine or notice. If you receive a notice, it will come from the police department or the company that operates the reader, not automatically from the scan itself.

Are license plate readers legal?

Yes, in all 50 states. The technology itself is legal. What varies is how police and private companies can use the data and how long they can keep it. Some states have passed laws restricting use or requiring deletion, but no state has banned readers entirely.

Can I cover my license plate to avoid being scanned?

Covering or obscuring your plate is illegal in all states. It is a traffic violation that can result in a fine. Even if you disagree with license plate readers, covering your plate is not a legal way to avoid them.

What should I do if I think my data was misused?

File a complaint with your local police department's internal affairs division or your state attorney general. If you believe your rights were violated, you can consult with a lawyer about filing a civil lawsuit, though this is expensive and outcomes vary. Contact a civil rights organization like the ACLU or Electronic Frontier Foundation for guidance on your specific situation.