Locate and destroy RFID

What an interesting device! RFID washer: "RFIDwasher finds RFID tags and “electronically washes” it, thus protecting your privacy. (...) It disables the tag using patented prioprietary technology (...) it is designed to destroy all tags that you will find on everyday objects – these are known as passive tags. It is not designed to destroy active tags which are used in industrial applicatio"