Vancouver, Canada — In 2025, the legislative landscape for automated license plate recognition (ALPR) technology in the United States is undergoing a marked transformation. Lawmakers in more than a dozen states are introducing bills designed to refine, restrict, or, in some cases, expand how plate data can be collected, stored, and shared by law enforcement and private entities. Against this backdrop, Amicus International Consulting has released its most comprehensive update to date of its ALPR Plate-Data Retention and Sharing Map, a jurisdiction-by-jurisdiction reference designed to help residents, businesses, and advocacy groups navigate an increasingly fragmented regulatory environment.
The Expanding Reach of ALPR Technology
ALPR systems, installed on police cruisers, traffic enforcement vehicles, highway overpasses, and fixed surveillance points, have been in use in the United States for over two decades. These systems capture high-resolution images of license plates, along with time, date, and GPS location metadata, and automatically compare them to databases containing stolen vehicle records, outstanding warrants, and persons of interest.
While ALPR has proven valuable in recovering stolen cars, locating wanted suspects, and supporting Amber Alerts, its expansion into continuous, mass-scale data collection has raised concerns about privacy, accuracy, and the scope of permissible use. Unlike targeted surveillance, ALPR systems record the movements of ordinary citizens, creating what privacy advocates describe as “location dossiers” capable of revealing personal routines, political affiliations, and private associations.
Why Legislators Are Moving Now
Three converging factors are driving the current wave of legislative proposals:
Public Outcry Over Retention Lengths — In some jurisdictions, ALPR data is stored for years without any statutory requirement for purging records unrelated to active cases.
Interstate and Federal Sharing Practices — Plate data collected locally is often uploaded to regional or national databases accessible to federal agencies and other states, circumventing local privacy protections.
Judicial Signals on Location Tracking — Legal scholars and some court rulings have begun to suggest that long-term, comprehensive location tracking, whether by GPS, cell site data, or ALPR, may require warrants under the Fourth Amendment.
State Legislative Trends in 2025
The Amicus map documents a clear legislative momentum toward tightening retention and sharing rules:
California — A bill in the state assembly would reduce the current 60-day maximum retention period to 30 days, unless linked to a specific, documented investigation. It would also impose quarterly public reporting requirements for any data sharing with outside agencies.
Virginia — Proposed legislation would prohibit sharing ALPR data with out-of-state agencies except for felony cases. The bill responds to reports of data being used for civil enforcement actions, such as toll violations, outside of Virginia’s jurisdiction.
New York — Lawmakers are considering a measure requiring judicial warrants for any ALPR queries covering more than 24 hours of historical data, drawing on reasoning from Carpenter v. United States regarding prolonged tracking.
Colorado — A bill would create a statewide ALPR oversight board, setting uniform technical standards, auditing protocols, and minimum accuracy thresholds for all law enforcement use.
Texas — A proposal seeks to mandate deletion of ALPR data within 14 days unless tied to an active case, alongside mandatory encryption and restricted officer access.
Historical Evolution of ALPR Rules
In the early 2000s, ALPR systems were deployed primarily for limited traffic enforcement purposes, with little public awareness and minimal regulation. As adoption expanded, so did integration with commercial databases, creating hybrid systems where law enforcement could access plate data collected by private entities such as repossession companies and parking operators.
The absence of early legislative guardrails meant that many agencies set their retention policies, often defaulting to indefinite storage. By the mid-2010s, investigative reporting and public records requests began revealing the breadth of collection and the absence of meaningful deletion schedules. This prompted the first wave of state-level restrictions in places like Maine, New Hampshire, and Vermont, which adopted retention periods measured in days, not years.
Privacy Risks in Interstate Data Sharing
One of the most contentious aspects of ALPR policy is the sharing of data between jurisdictions. States often upload their plate scans to regional fusion centers or national databases like the National Vehicle Location Service (NVLS), giving agencies far beyond the original point of collection the ability to query a resident’s movements.
While proponents argue that cross-jurisdictional access is essential for tracking suspects across state lines, critics warn that it undermines state-level privacy protections. For example, a state with a 30-day retention limit may see its residents’ data stored indefinitely in another state’s database once shared.
Amicus’s Updated Plate-Data Retention and Sharing Map
The 2025 Amicus map categorizes each state by:
Retention Periods — Ranging from as short as 7 days in New Hampshire to as long as 5 years in certain states without statutory limits.
Access Controls — Whether officer queries require supervisory approval, case numbers, or warrants.
Permitted Uses — Whether restricted to serious crimes or available for any law enforcement purpose, including civil enforcement.
Interstate Sharing Policies — Whether sharing is unrestricted, case-based, or prohibited absent certain conditions.
Transparency Requirements — Whether agencies must publish annual or quarterly usage and sharing reports.
Case Study 1: Small Business Owner in a Multi-State Corridor
A logistics company operating along the I-95 corridor consulted Amicus to assess ALPR risks. The firm’s fleet regularly passed through multiple states with different retention policies. The Amicus analysis identified segments of the route where plate data would be stored for years and shared broadly, versus states with short retention and limited sharing. The company adjusted schedules and delivery points to minimize unnecessary data capture, while remaining compliant with all transport regulations.
Case Study 2: Virginia Resident and Toll Violation Dispute
A Virginia resident received a civil penalty from an out-of-state tolling authority based on ALPR data. The resident, with legal support, challenged the sharing of the data, arguing that it violated state policy intent. Amicus’s review of pending legislation provided leverage to negotiate a withdrawal of the fine, illustrating how awareness of proposed laws can influence current disputes.
Case Study 3: California Privacy Advocate Pushes for Reform
A nonprofit advocacy group in California used Amicus’s map to demonstrate that local agencies were retaining plate data longer than in neighboring states with similar crime rates. The visual comparison became a central exhibit in testimony supporting the 30-day retention bill.
Constitutional Questions and Judicial Oversight
While license plates are displayed in public, the aggregation of millions of scans into searchable databases raises different legal questions. Courts are increasingly asked to decide whether ALPR data constitutes a form of prolonged surveillance requiring probable cause and a warrant.
The Supreme Court’s 2018 decision in Carpenter established that accessing extensive cell phone location history without a warrant violates the Fourth Amendment. Although the Court has not yet ruled directly on ALPR data, several state courts have applied Carpenter’s reasoning, particularly where historical queries reveal patterns over weeks or months.
Technical Accuracy and Misidentifications
Beyond privacy, technical limitations can cause direct harm. Misreads of plates due to dirt, damage, or partial obstructions have led to wrongful stops and arrests. Legislative proposals in Colorado and New York would require minimum accuracy certifications, third-party testing, and error-reporting protocols to mitigate these risks.
Public Awareness and the Role of Transparency
Amicus notes that public knowledge of ALPR use remains uneven. In states with mandatory public reporting, advocacy groups and journalists have been able to scrutinize patterns of use and identify discrepancies between stated policies and actual practices. In states without such requirements, residents may be unaware that their movements are being logged daily.
Amicus Recommendations for Residents and Businesses
In its updated ALPR advisory, Amicus suggests:
Know Your State’s Rules — Use the map to identify retention and sharing policies in your jurisdiction.
Request Records — File public records requests to learn how often and for what purposes your local agencies query ALPR databases.
Understand Interstate Risks — If you travel or operate commercially across state lines, map routes to understand where and how your data will be handled.
Engage in Legislative Processes — Comment on proposed bills, provide testimony, and use public hearings to influence policy.
Consider Data Minimization Strategies — While you cannot avoid being scanned in public, strategic route planning and parking choices can limit unnecessary data capture.
The Global Context
Internationally, approaches to license plate recognition vary widely. The European Union’s General Data Protection Regulation (GDPR) treats plate data as personal information, imposing strict limitations on retention and sharing. In Australia, ALPR is widely used for tolling and enforcement, but with statutory limits on use outside of traffic regulation. Canada’s provincial systems often combine ALPR with real-time alerts, but generally maintain shorter retention periods than the U.S.
Looking Ahead
Amicus predicts that by 2027, most U.S. states will have codified explicit retention and sharing rules for ALPR data. The firm expects greater convergence between ALPR regulation and broader digital privacy laws, potentially including warrant standards for historical queries exceeding a set duration. Public reporting, independent audits, and cross-border data-sharing controls are likely to become central points of legislative negotiation.
Conclusion
The growth of ALPR technology has outpaced the development of consistent privacy protections, but 2025 marks a significant turning point. As bills advance in multiple states, residents and businesses have both the need and the opportunity to understand how their data is handled. Amicus International Consulting’s updated Plate-Data Retention and Sharing Map provides a critical tool for navigating this complex environment, empowering stakeholders to make informed choices and to participate effectively in shaping policy.
Contact Information
Phone: +1 (604) 200-5402
Email: [email protected]
Website: www.amicusint.ca
