He was asking all of us intelligence and law enforcement types what we would do to improve security. So we started talking about national identity cards. What would it have? Well, a thumbprint. That’s unique. (Your fanny print is unique, by the way, if you hang around Xerox machines.) Blood type would be useful, as would a retinal scan. We would want your picture, taken a special way so that we could pick your face out of a crowd even if you were wearing a disguise. We would want your voice print, because the technology is coming up that will pick your voice out of every other voice in all the cell phones on earth, and your voice is unique. In fact, we would like to have a bit of your DNA [deoxyribonucleic acid] in there, so if something ever happens to you we can identify the body. By the way, we would want the chip to tell us where this card is, so that if we needed to find you we could. Then it dawned on us that if we did that, you could set the card down so we should put the chip in your bloodstream. Then, best of all, the chip would tell us when you were sick and we could tell you when you needed to go to the hospital, so we could cut medical costs. Let me assure you, we could save you a fortune with that. Of course, we’d know where you were all the time.

Analysis, Analysts, and Their Role in Government and Intelligence - James M. Simon, Jr.  [pp.12]