"Human chipping is considered one of the more far-fetched options for future human identity management. It forms an intrusion in the body and hence evokes medical risks that tokens and biometrics do not have. It is also more controversial (‘mark of the beast’) than ID-cards, surveillance cameras and biometrics together. Nevertheless, implanting an RFID chip directly under the skin is already more prevalent than one would expect. Most common is the implant for medical or research purposes."