Non veni pacem mittere, sed gladium.
some where out there is a clever lad making a small device that announces loudly when some clown tries to access the RFID chips in the card in you pocket. it would give you the opportunity to provide some instanter justice. as the device emits RF and is unlicensed, that is a $5,000.00 per incident per day fine and perhaps a little jail time. seriously, it is on the to do list to find a device to receive and warn of a miscreant in the area. secure wallet is a really good idea also