There is no single U.S. deadline for deleting automated license plate reader (ALPR) data. Retention depends on the state law, agency policy, and system or vendor configuration; data preserved for an investigation or legal process may be kept under different rules than routine records. Access is also restricted differently by jurisdiction and agency. The examples below are specific to the named laws, agencies, and policy versions—not nationwide rules.
How long ALPR data is stored in these U.S. examples
ALPR systems capture plate images and associated information, such as the interpreted plate characters, location, and time. The periods below concern the named jurisdiction or system; they are not a national standard. A statutory limit, an agency’s stated practice, and a vendor setting are different kinds of rules.
| Jurisdiction or system | Routine retention stated in the source | Preservation or other exceptions | Access, sharing, or disclosure stated in the source |
|---|---|---|---|
| Washington state law, RCW 10.130.040; page accessed October 4, 2026, and referencing 2026 legislation | Generally no more than 21 days for data covered by the statute. | Exceptions include qualifying court-issued process or court orders; parking-enforcement data, which must be deleted no later than 12 hours after final disposition; traffic-study data, limited to 30 days; commercial-vehicle systems, limited to six months; and data needed as evidence of specified unlawful conduct. The statute also limits use and sharing to the authorized purpose. | The statute restricts use and sharing for purposes other than those authorized by the law. It does not establish one access rule for every ALPR system outside its scope. |
| North Carolina, General Statutes § 20-183.32 | Captured plate data generally may not be preserved for more than 90 days after capture. | Specified preservation requests and search warrants permit preservation beyond the ordinary period. After one year from the initial preservation request, the custodian must destroy the data under its policy unless another preservation request resets the period. | Disclosure is limited to specified criminal justice officials for legitimate law-enforcement purposes on written request. Covered data is confidential, is not a public record, and may not be sold. The statute bars use of covered data for traffic-violation enforcement. |
| Illinois State Police Vehicle Manager platform; agency transparency page accessed October 4, 2026 | The Illinois State Police says its platform retains reads for a maximum of 90 days, then automatically deletes them. This is the agency’s description of its platform, not a statewide rule established here for every local system. | The agency’s page describes automatic deletion after the stated maximum; it does not establish a general rule for separate evidentiary copies held outside that platform. | The agency says trained law-enforcement personnel may access the system, and sharing is limited to law-enforcement entities for law-enforcement or public-safety functions with written consent or a memorandum of understanding. It says activity is permanently logged and audited monthly, and that its ALPR data is not subject to FOIA disclosure. |
| Northern California Regional Intelligence Center (NCRIC), 2024 policy | The policy supports a maximum retention period of 365 days, but says the selected vendor at that time imposed a 30-day maximum. Shorter limits in applicable law or vendor configuration prevail. | Records exported for an active investigation become subject to the retention rules for that investigation. | The policy describes audit records including user name, agency, access date and time, queried plate, and a valid case number. Its rules apply to the NCRIC policy and systems it covers. |
These figures cannot be read as a general U.S. range: they come from different kinds of authority and cover different systems. The Los Angeles County Sheriff’s Department privacy-policy page says its policy was updated April 22, 2026, but the cited page does not establish a specific retention period; consult that policy for details rather than applying another agency’s limit.
Who can access ALPR data?
Access usually means permission to query or view records inside a system. It is not the same as public disclosure, and a rule for one agency’s system does not establish who can access another agency’s data.
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- Authorized users: The cited North Carolina law limits disclosure to specified criminal justice officials making a written request for a legitimate law-enforcement purpose. Illinois State Police says access to its platform is limited to law-enforcement personnel who completed training.
- Sharing with other agencies: Illinois State Police says sharing is limited to law-enforcement entities for law-enforcement or public-safety functions and requires written consent or an MOU. North Carolina requires agency policies to address interagency sharing and access to data from systems an agency does not operate.
- Purpose restrictions: North Carolina restricts use and disclosure to law-enforcement purposes and bars using covered data for traffic-violation enforcement. Washington’s cited law restricts use and sharing to purposes it authorizes. The LASD privacy-policy page describes authorized public-safety uses and says its data may not be used for civil immigration enforcement.
- Auditing: Illinois State Police says system activity is logged and audited monthly. NCRIC’s 2024 policy specifies audit details such as the user, agency, time, queried plate, and case number. These examples do not show that every agency keeps identical logs or audits them on the same schedule.
Why records may remain after routine deletion would apply
A routine retention limit governs ordinary system records; it does not necessarily decide how long a specific record can be held after it has been formally preserved or exported as evidence. North Carolina law provides for specified preservation requests and search warrants. Washington law has purpose-specific exceptions, including qualifying court process and evidence of specified unlawful conduct. Under NCRIC’s 2024 policy, records exported for an active investigation follow the investigation’s retention rules.
In North Carolina, a preservation request must identify the relevant camera, plate, date and time, case, and facts supporting the data’s relevance. The statute also requires destruction under the custodian’s policy after the applicable preservation period unless a new request resets it. A particular record’s later disposition may therefore depend on the legal process and the custodian’s records schedule, not just the routine ALPR setting.
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Does the public have a right to see the data?
Not necessarily. North Carolina calls covered captured plate data confidential and not a public record. Illinois State Police says ALPR data in its system is not subject to FOIA disclosure. Those statements concern the data and authorities named by those sources; they do not establish that every related record is withheld everywhere. An agency policy, contract, audit report, or aggregate report may receive different treatment under the applicable law.
For a records request, identify the record sought precisely—for example, a specific plate read, an access log, a policy, or an aggregate report—and ask the agency which statute or exemption governs that record. Do not assume that a denial of access to raw plate data also answers whether related policy or oversight records can be disclosed.
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How to check the rule for your location
- Identify the state and agency. A statewide statute may cover systems differently from a city or county policy, and an agency may query a system operated by another agency or regional center.
- Find the current statute and ALPR policy. Check effective dates and look for sections titled retention, deletion, preservation, sharing, access, audit, and public records. A policy may have changed since an older report or system description.
- Determine which system holds the record. Ask whether the data is in the original ALPR platform, another agency’s shared system, or an exported investigative file. Vendor limits and legal retention rules are not interchangeable.
- Ask about exceptions and logs. If you need a particular record, ask whether it was preserved under a warrant, court order, investigation, or another exception, and whether the agency maintains query and sharing audit logs.
Without the state, agency, and system, a precise local retention deadline or access list cannot be established. The controlling answer is the current law and policy for the system that holds the data.
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