A tamper-resistant RFID wristband that becomes permanently disabled upon tampering. The wristband includes a plurality of holes for snugly securing the band to a wearer, an RFID circuit, and an electrically conductive loop disposed in the band. The RFID circuit and the conductive loop are electrically...http://www.google.de/patents/US7579950?utm_source=gb-gplus-sharePatent US7579950 - Identification band using serpentine paths to detect tampering
