Actually, this raises an interesting thought. Couldn't a security-conscious user take advantage of this to turn "something you are" into "something you have"? S

Actually, this raises an interesting thought. Couldn't a security-conscious user take advantage of this to turn "something you are" into "something you have"? Since you can train the sensor with anything, is there a market for semi-permanent, cryptographically-random... Thumb rings, or something?