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Automated license plate readers (ALPRs) photograph vehicle plates, convert the images into searchable data, and compare that data with vehicle databases or watchlists. An alert means the system detected a possible match; it is not, by itself, independent confirmation of the plate or proof of wrongdoing. What happens to a record after capture—including who may search or share it and when it must be deleted—depends on the agency, its vendor arrangements, and the law in that jurisdiction.
How do license plate readers collect data?
1. Cameras capture plate images
ALPR systems use fixed or mobile cameras to capture images of vehicle license plates as vehicles pass. The U.S. Department of Justice’s Office of Justice Programs (OJP) describes systems that capture plate images automatically within seconds. Camera placement, image quality practices, and the exact information a system records can differ; they should not be assumed to be identical across systems.
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2. Software converts images into searchable records
Software reads identifying information from the image and checks it against databases or lists of vehicles of interest. If the data appears to match a record on a list, the system may send an alert to an officer. An alert is a result of that comparison, not a finding that a crime occurred. The OJP account describes the general workflow, not a universal confirmation procedure; agencies should verify a potential match before acting on it.
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Depending on the system and governing rules, an agency may retain the image, the data read from it, or associated records so authorized users can search them later. Which fields are kept, how long they remain available, and whether a vendor processes or stores data depend on the agency’s configuration, agreements, policy, and applicable law. There is no single national retention period established by the examples below.
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Who can access license plate reader data?
Access is not governed by one nationwide rule. Agencies may define which employees can use a system, what searches are allowed, and how access is monitored. State laws may require written policies addressing access, security, training, oversight, audits, and use of databases. For a particular system, the agency’s current policy and the law for the relevant state are more useful than assuming that every officer, agency, or vendor has the same access.
North Carolina’s policy and use requirements
Under North Carolina General Statutes § 20-183.31, state and local law-enforcement agencies must adopt a written policy before operating a covered system. The policy must address matters including comparison databases, retention and sharing, training, oversight, internal access and security, audits, and access to systems operated by another agency. The law limits covered use to law-enforcement purposes and bars using data obtained under the article to enforce traffic violations. It states: “Data obtained by a law enforcement agency in accordance with this Article shall be obtained, accessed, preserved, or disclosed only for law enforcement purposes.”
California’s policy guidance
The California Department of Justice says SB 34 requires agencies to provide a written usage and privacy policy and emphasizes that collection, storage, sharing, and use must comply with state law. Its guidance also discusses legal limits relevant to immigration enforcement under the Values Act. The precise rules depend on the underlying law and current agency policy; the announcement is not a substitute for reviewing either.
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Do police share license plate reader data with other agencies?
Sharing is possible, but it is not universal. Whether one agency can query another agency’s system, receive its records, or share records across jurisdictional or state lines depends on applicable law, agency policies, and any relevant agreements. North Carolina requires written policies to address sharing and access to systems operated by other agencies, and restricts covered data to law-enforcement purposes. California DOJ guidance calls attention to legal limits on sharing, including those relevant to immigration enforcement.
For a specific agency, check its current usage and privacy policy and any disclosed sharing agreements. Useful details include which agencies or outside parties may receive data, what purposes are allowed, how a request is authorized, and whether access is logged and audited. The available state examples show differing controls; they do not establish that all agencies share data with vendors, neighboring agencies, or federal agencies.
The Electronic Frontier Foundation (EFF), an advocacy organization, describes public-records litigation and advocacy over ALPR records and cross-jurisdiction sharing. EFF reports that, in a settlement, the Marin County Sheriff’s Office agreed to stop sharing data outside California. That is EFF’s account of the settlement; consult the settlement itself for its precise legal terms.
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How long do police keep license plate reader data?
Retention periods vary by jurisdiction and may have exceptions for particular records or legal processes. These two state laws illustrate how different the rules can be; neither period is a nationwide standard.
| Jurisdiction and source | General rule for covered data | Exceptions and qualifications |
|---|---|---|
| North Carolina, General Statutes § 20-183.32 | Covered captured plate data generally may not be preserved for more than 90 days. | The statute provides exceptions and a process for preservation requests tied to particular cameras, plates, time frames, facts, and cases. The data is confidential and not a public record; disclosure is generally limited to specified criminal-justice officials for a legitimate law-enforcement purpose on written request. The data may not be sold. |
| Washington, Revised Code § 10.130.040 | Covered data generally must be retained for no more than 21 days. | The statute sets out exceptions with distinct conditions or deadlines, including case-related court process, parking enforcement, traffic studies, commercial-vehicle systems, and evidence of specified unlawful conduct. The cited page notes 2026 c 239; applicability to a particular event depends on the provision’s effective date. |
These rules apply to the data covered by the respective statutes; they should not be generalized to every plate-reader record, agency, or state. For another location, consult the current statute and agency policy. The National Conference of State Legislatures (NCSL) summarizes state approaches, including policy requirements, retention limits, sharing or sale restrictions, and public-record exemptions, but its overview is a starting point rather than a substitute for checking current law.
What historical surveys say—and what they do not
OJP’s 2012 report offers historical evidence about agency practices at that time, not a current nationwide estimate. It surveyed state, local, and tribal law-enforcement agencies, with substantial drop-off between the initial and detailed surveys. Its findings should be read with those sample sizes and respondent limits in view.
| 2012 OJP finding | What the figure describes |
|---|---|
| 305 of 500 agencies responded (61.0%) | Response to the initial survey. |
| 70 agencies (23.0%) reported ALPR use | Reported use in the initial survey. |
| 40 of those 70 agencies (57.1%) responded | Response to the detailed follow-up survey. |
| 48% of detailed follow-up respondents had ALPR policies | Policy adoption among follow-up respondents, not all U.S. agencies. |
| 40% of respondents retained data for six months or less | Retention reported by survey respondents. |
| Five respondents (13%) retained data indefinitely | Indefinite retention reported by five detailed-survey respondents. |
| 95% reported mobile systems | System type reported by respondent agencies. |
| 69% reported auto-theft use; 28% vehicle and traffic enforcement; 25% investigations | Uses reported by respondents; categories describe survey responses, not a measured national census. |
These results document practices and policy concerns reported in 2012. They do not show how many agencies use ALPRs today, how current systems are configured, or what current retention policies require.
Quick Recap
How to find the rule for a particular agency
- Identify the operator and location. Determine which agency operates the cameras or controls the records, and which state’s law applies.
- Find the current written policy. Look for the agency’s ALPR usage, privacy, or data-management policy. Check its effective or revision date.
- Check the statute and exceptions. Read the current state law for collection purposes, access, sharing, routine deletion, preservation requests, and exceptions. A state summary can help locate issues, but verify the primary statute.
- Review sharing and vendor arrangements. Look for agreements or policy language covering other agencies, system operators, or service providers, and note any limits on queries or onward disclosure.
- Check oversight and records access. Determine whether the policy provides for access logs, audits, public reporting, or a process to request records. Public-record access varies, and some statutes make covered data confidential or exempt.
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