2 hours, 26 minutes ago
VeriChips, radio frequency microchips the size of a grain of rice, have already been used to identify wayward pets and livestock. And nearly 200 people working in Mexico's attorney general's office have been implanted with chips to access secure areas containing sensitive documents.
http://story.news.yahoo.com/news?tmpl=story&ncid=&e=13&u=/ap/20041013/ap_on_hi_te/fda_implantable_chip