RFID (Radio Frequency ID) chips emit a little radio signal that contains digital information, and this signal can also be used to track them. They’re versatile: perfect for warehouses to track cases, scary as hell when they talk about putting them in people. They’re stupid when in credit cards. Stupid and dangerous and NOBODY SHOULD USE THEM.

And now, here’s a video, about how right I am on the last bit.

Your welcome.