Even for id's, we need to be careful. They can't be the end-all solution, because they aren't permanent (I know people who have accidentally lost their thumbpri

Even for id's, we need to be careful. They can't be the end-all solution, because they aren't permanent (I know people who have accidentally lost their thumbprints through burning, for instance). Phones today get around that by making you also set a pattern or pin to get in.