Build your own RFID Zapper out of a cheap disposable camera and confuse the bits out of your local superstore. Or police station. As you’ll likely be invited to visit there shortly.
To keep the costs of the RFID-Zapper as low as possible, we decided to modify the electric component of a singe-use-camera with flash, as can be found almost everywhere…It generates a strong electromagnetic field with a coil, which should be placed as near to the target RFID-Tag as possible. The RFID-Tag then will receive a strong shock of energy comparable with an EMP and some part of it will blow, thus deactivating the chip forever.