A method and apparatus keeps track of ingestible objects (such as pills or food items) ingested by humans or animals. The objects are supplied with radio frequency identification (RFID) tags encoding data describing the objects. The humans or animals ingesting the objects are equipped with RFID sensors...http://www.google.com.tw/patents/US7427266?utm_source=gb-gplus-share專利 US7427266 - Method and apparatus for verification of ingestion
