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Fig. 1B —Photographs show radiofrequency identification (RFID) tags
(VeriMed, VeriChip) and device (TagFinder, Health Beacons). Photograph shows
handheld TagFinder LCD display (black arrow) shows distance between
detector element (straight white arrow) and nearest end of tag. Read
button (curved white arrow) causes LCD to display tag's unique
identification number, eliminating false-positive readings and allowing
neighboring tags to be distinguished.