An anonymous reader quotes a report from Reuters: For the first time, a federal judge has suppressed evidence obtained without a warrant by U.S. law enforcement using a stingray, a surveillance device that can trick suspects' cell phones into revealing their locations. U.S. District Judge William Pauley in Manhattan on Tuesday ruled that defendant Raymond Lambis' rights were violated when the U.S. Drug Enforcement Administration used such a device without a warrant to find his Washington Heights apartment. Stingrays, also known as "cell site simulators," mimic cell phone towers in order to force cell phones in the area to transmit "pings" back to the devices, enabling law enforcement to track a suspect's phone and pinpoint its location. The DEA had used a stingray to identify Lambis' apartment as the most likely location of a cell phone identified during a drug-trafficking probe. Pauley said doing so constituted an unreasonable search. The ruling marked the first time a federal judge had suppressed evidence obtained using a stingray, according to the American Civil Liberties Union, which like other privacy advocacy groups has criticized law enforcement's use of such devices. "Absent a search warrant, the government may not turn a citizen's cell phone into a tracking device," Pauley wrote. FBI Special Agent Daniel Alfin suggests in a report via Motherboard that decrypting encrypted data fundamentally alters it, therefore contaminating it as forensic evidence.