Apparently there are 150 people in the world that are human trackables. They have a tattoo of their TB code.
I've just read that someone has taken that one step further and have had an RFID implanted in their hand.
Check it out at It's Not About the Numbers.
Yes, yes, yes I'm a little behind the times here, no doubt half of Berkshire have one now. Probably a good thing!
I bet Dr Solly wants one!