RedFerret had a link to this do-it-yourself RFID Zapper. It can be used to deactivate (a better word is probably “destory”) RFID tags found in commonly purchased consumer products. This is done by subjecting the RFID tag to a strong electromagnetic field in order to “fry” its internal electronic components. The plans on the site are based on building the zapper using a disposable camera case. My view is that privacy advocates who wish to deactivate RFID tags on items they’ve purchased should construct a device they can use at home. Not a disguised portable device that might be better suited to assisting shoplifters.