Faraday bag

plural Faraday bags

1. A bag made of a material that blocks electromagnetic signals, and employing special sewing techniques such as dual paired seam construction, used to hold devices such as cell phones in order to prevent outside signals from interfering with the contents of the device.

   For instance. when a cell phone is found. proper forensic protocol may call for it to be placed in a Faraday bag, which prevents stray signals from going in or out.

   2006, Scott Christianson, Bodies of Evidence: Forensic Science and Crime, page 171