"RFID" stands for radio-frequency identification. An RFID tag is a microchip that stores information that can be read from a distance by a special device called a reader or interrogator. RFID tags are now found in some passports, driver's licenses, employee and university identification cards, and even some credit cards. The RFID tags in some of these cards can be read from up to 30 feet away, and the possibility of identity theft concerns some RFID card carriers. Fortunately, since metal effectively blocks radio waves, it's easy to retrofit a wallet to protect cards from RFID scanning.
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Use a pen or pencil to trace the credit card onto the cardstock, then cut out the "dummy card" with scissors. Repeat this step to create a second dummy card.
Wrap each dummy card in aluminum foil. To make the card easy to slide into the wallet, and to help hold the foil in place, you may optionally wrap duct tape or packing tape around the foil dummy cards.
Open the wallet and examine how it folds up. Identify the card slot nearest one side of the folded wallet and insert one of the foil-wrapped dummy cards. Do the same with the other dummy card for the other side of the wallet.
Protect cards in a wallet that opens in several stages by adding more strategically placed foil-wrapped dummy cards.