First of i want to say, the government isnt RFID tagging everyone to keep track of people, that is a ridiculus claim. RFID chips cant hold very much data and need to be fairly close to be scanned. (However your phone is a better target for stuff like that…)
Anyway, there might be reasons to want to check if things are marked with an RFID tag. Maybe on clothes you bought that set of alarms in stores, or check if a buscard is broken.. Either way here is an open source RFID sniffer, to check if there are any RFID chips nearby!
RFID is everywhere. Use the easy to build RFID sniffer to find out if objects are tagged.
The RFID sniffer is a simple analog electronic circuit which can detect the presence of 13.56 MHz RFID tags. These tags are commonly used in all kinds of plastic cards like access badges, bank cards, library cards, loyalty cards and so on. Also many other objects may carry RFID tags without you knowing it. Books, toys, and even clothing might be tagged. Carrying tagged objects with you can reveal your identity or whereabouts to anyone equipped with the appropiate tools to read RFID tags.
The RFID sniffer helps you identify which objects are tagged, and which are not.
-From the website