Warrant or No, Cops Can Use Aluminum Foil To Block Smartphone WipingRobert Sorokanich8/28/13 12:10pmFiled to: privacymobilesupreme courtfoil1222EditPromoteShare to KinjaToggle Conversation toolsGo to permalinkThe legal debate over whether police need a warrant to search a suspect's cellphone is more than just raging on — it's headed to the Supreme Court. But even if the nation's highest court decides a warrant is needed, the authorities could still block you from remote-wiping your phone while they wait for the legal OK to search. And all it takes is the aluminum foil in your kitchen.Yes, law Professor Adam Gershowitz recommends that, in cases where police have seized a phone but aren't yet allowed (legally) to search it, they should wrap the phone in multiple layers of aluminum foil to block remote bricking or wiping. The foil would create an improvised Faraday cage, blocking all wireless signals until a warrant is obtained. Naturally, the paper also recommends commercially available Faraday bags or data extraction software, but the improvised aluminum foil method seems much more likely to be used by cops on patrol.