I think, as was pointed out, biometrics is clearly part of the evolution of being able to identify people and be certain of your identification. Frankly, I haven't done any recent work on biometrics. I know that in some cases there are some concerns about how fast the work on biometrics has progressed, but that was some years ago.
You're a little out of my subject area at this point for me to give you a learned comment on biometrics from A to Z.