This is interesting. I like the idea of using multiple devices. For instance a smartphone that needs say one more device. Whether that be a electronic necklace, cuffing, or pen to be able to access certain information. On the other hand, the idea of using genetics and certain biological features could be a problem in the long run of things, because as you all know we aren't immortal. I also think it could sacrifice our privacy as well if we went on a more bio-route of security.