EFF: To Search Through Millions of License Plates, Police Should Get a Warrant

EFF: To Search Through Millions of License Plates, Police Should Get a Warrant by Andrew Crocker:

Earlier this week, EFF filed a brief in one of the first cases to consider whether the use of automated license plate reader (ALPR) technology implicates the Fourth Amendment. Our amicus brief, filed in the Ninth Circuit Court of Appeals in United States v. Yang, argues that when a U.S. Postal Service inspector used a commercial ALPR database to locate a suspected mail thief, it was a Fourth Amendment search that required a warrant.

ALPRs are high-speed, computer-controlled camera systems. Some models can photograph up to 1,800 license plates every minute, and every week, law enforcement agencies across the country use these cameras to collect data on millions of license plates. The plate numbers, together with location, date, and time information, are uploaded to a central server, and made instantly available to other agencies. The data include photographs of the vehicle, and sometimes of its drivers and passengers. ALPRs are typically attached to vehicles, such as police cars, or can be mounted on street poles, highway overpasses, or mobile trailers.

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