02-09-2016, 05:26 PM
The Global Entry cards (which have RFID chip) come with foil lined pouches. The material advises the user to store the card in the pouch at all times, other than when presenting the card to an official, to avoid scanner theft.
The full wallet foil idea would be better if you have many cards though.
The full wallet foil idea would be better if you have many cards though.