The contactless card payment system is very handy but there is talk of the possibility of skimming a card by brushing against a victim's wallet with a simple gizmo. In fact, I've seen it done on TV. What are the thoughts about how effective the screening could be with a piece of foil placed in the wallet? I would have expected it to give a good 20 or 30 dB worth of protection. Even two cards, side by side in the same wallet could possibly protect each other - I know my bus pass won't work when it's next to a credit card and I have to unfold my wallet before offering it up to the pad. I started googling but then I though that some PF members might have the knowledge about this already and maybe, even have experimented.