EPIC Senior Counsel Alan Butler will testify today before the Maryland House of Delegates concerning "Cell Site Simulator Technology, Historical Location Information, and Aerial Surveillance by Police." The hearing follows a recent complaint to the FCC regarding the use of "Stingrays," fake cell phone towers, by the Baltimore Police Department to intercept private communication. In a 2013 Freedom of Information Act suit against the FBI, EPIC uncovered plans involving federal and state law enforcement agencies to keep the use of Stingrays secret. EPIC has since argued in amicus briefs that cell phone location data is protected by the Fourth Amendment. Baltimore Police used Stingrays to track more than 1,700 individuals between 2007 and 2014.