Mountain View, California, pulled the plug on its entire license plate reader camera network this week. It discovered that Flock Safety, which ran the system, had been sharing city data with hundreds of law enforcement agencies, including federal ones, without permission.

Flock Safety runs an automated license plate recognition (ALPR) system that uses AI to identify vehicles’ number plates on the road. Mountain View Police Department (MVPD) policy chief Mike Canfield ordered all 30 of the city’s Flock cameras disabled on February 3.

Two incidents of unauthorized sharing came to light. The first was a “national lookup” setting that was toggled on for one camera at the intersection of the city’s Charleston and San Antonio roads. Flock allegedly switched it on without telling the city.

That setting could violate California’s 2015 statute SB 34, which bars state and local agencies from sharing license plate reader data with out-of-state or federal entities. The law states:

“A public agency shall not sell, share, or transfer ALPR information, except to another public agency, and only as otherwise permitted by law.”

The statute defines a public agency as the state, or any city or county within it, covering state and local law enforcement agencies.

Last October, the state Attorney General sued the Californian city of El Cajon for knowingly violating that law by sharing license place data with agencies in more than two dozen states.

However, MVPD said that Flock kept no records from the national lookup period, so nobody can determine what information actually left the system.

Mountain View says it never chose to share, which makes the violation different in kind. For the people whose plates were scanned, the distinction is academic.

A separate “statewide lookup” feature had also been active on 29 of the city’s 30 cameras since the initial installation, running for 17 straight months until Mountain View found and disabled it on January 5. Through that tool, more than 250 agencies that had never signed any data agreement with Mountain View ran an estimated 600,000 searches over a single year, according to local paper the Mountain View Voice, which first uncovered the issue after filing a public records request.

Over the past year, more than two dozen municipalities across the country have ended contracts with Flock, many citing the same worry that data collected for local crime-fighting could be used for federal immigration enforcement. Santa Cruz became the first in California to terminate its contract last month.

Flock’s own CEO reportedly acknowledged last August that the company had been running previously undisclosed pilot programs with Customs and Border Protection and Homeland Security Investigations.

The cameras will remain offline until the City Council meets on February 24. Canfield says that he still supports license plate reader technology, just not this vendor.

This goes beyond one city’s vendor dispute. If strict internal policies weren’t enough to prevent unauthorized sharing, it raises a harder question: whether policy alone is an adequate safeguard when surveillance systems are operated by third parties.

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