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A federal judge ruled that a sheriff's deputy violated a woman's Fourth Amendment rights by using Flock's automated license plate reader network to search for her vehicle without a warrant, calling the system "indiscriminate mass surveillance." The ruling adds legal weight to mounting criticism of Flock's nationwide camera network, which has been adopted by thousands of law enforcement agencies. In response to growing scrutiny, Senator Bernie Sanders introduced federal legislation that would ban government use of Flock and other automatic license plate readers. The developments mark an escalation in the pushback against the surveillance technology from both the courts and Congress.