So it's hardly a novel concept, but it's only now becoming likely that you'll see it in the real world: Fujitsu announced today that its palm readers will soon be installed in bank kiosks, building lobbies, and other places where you might need to verifyyouridentity at a checkpoint of some sort.
Train your staff never to give out their passwords over the phone, verify the identity of every building inspector and repairman that crosses the transom and run the trash through a shredder.