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

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…