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http://www.usatoday.com/story/news/politics/2014/01/14/roberts-gates-on-presidents/4475369/

Near the end of this article in USA Today, former Secretary of Defense Robert Gates mentioned that the President of the United States, Secretary of Defense, and Secretary of State all must use electro-magnetically protected tents in foreign lands to provide “a setting secure from surveillance.”  These tents are known as Faraday cages.  A Faraday cage “is a metallic enclosure that prevents the entry or escape of an electromagnetic field (EMF). * In most circumstances, a fine copper mesh is shaped into an enclosure to form a simple Faraday cage. For the President and his staff, the Faraday cage will prevent people from intercepting any electronic signals emanating from computers and telecommunications devices (such as wireless phones, tablets, etc.).  For digital forensic purposes, we use a Faraday cage to prevent a wireless phone from transmitting and receiving cellular signals, which is paramount in any case to avoid spoliation.

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