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How to keep rfid credit cards safe 
Place your rfid cards next to each other in your wallet. 
This can make it more difficult for thieves to read a particular card, but the protection is limited. 
Carry your rfid cards in a front pocket.
If you usually carry your credit cards in a wallet in your back pocket, you are potentially more vulnerable to thieves who could step up behind you with a scanning device. If you switch the cards to a front pocket, you will tend to be more observant of people in front of you and are less likely to become a victim.