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Civil liberties groups filed a complaint against the Baltimore Police Department, asking the FCC to investigate the department’s use of cellphone tracking devices, which are used in 24 states and the District of Columbia. The Baltimore police, along with other law enforcement agencies, are using stingrays, which are devices that mimic cellphone towers to track suspects’ locations through their cellphone signals. The civil liberties groups argue that this is a violation of Federal law that requires a license. […]