Legal Brief: ALPR Legal Risks Security Pros Need to Know
October 21, 2026
Security Business Magazine
Types : Bylined Articles
From Fourth Amendment precedent to a patchwork of state laws, the legal pitfalls around ALPR are creating genuine liability.
Automated license plate recognition (ALPR) technology has moved fast – faster, in many cases, than the legal frameworks designed to govern it.
Flock Safety cameras alone are now deployed in thousands of communities across the U.S., capturing the movements of millions of vehicles every day. Law enforcement agencies love them. Civil libertarians do not.
Somewhere in the middle, security industry professionals are being asked to deploy, service, and stand behind systems that carry significant and rapidly evolving legal risk. For integrators, understanding that risk exists is no longer optional.
While the U.S. Supreme Court has not directly addressed ALPR data, its landmark decision in Carpenter v. United States (2018) offers a meaningful preview of how the high court might handle an ALPR challenge.
Legal scholars contend that prolonged, warrantless surveillance of any kind constitutes an unreasonable search. In Carpenter, they were right. Whether that reasoning will reach ALPR remains to be seen, but the trajectory is worth watching.
No federal statute directly governs the collection, retention, and use of ALPR data. Instead, the rules are a patchwork of state laws ranging from permissive to highly restrictive.
Civil liberty concerns are now making front-page news. California filed suit against the City of El Cajon in October 2025, alleging the city illegally shared ALPR data with more than 100 out-of-state law enforcement agencies. California law prohibits public agencies from selling, sharing, or transferring ALPR information to anyone other than another California public agency.
Several states now require that contracts between law enforcement agencies and ALPR vendors specify that all system data remains the property of the agency, that the vendor will not independently sell or share data, and that the vendor must immediately notify the agency upon receiving any subpoena or third-party data request.
Security industry professionals should ensure their agreements contain robust indemnification provisions, clear data-ownership clauses, and mandatory breach-notification obligations. Who collects the data, who maintains it, and who owns it must be documented explicitly – ambiguity on any of those points creates exposure for both agencies and their vendors.