On Mon, 22 Sep 2003 01:13:16 +0100, David Boothroyd wrote:
What I wonder is whether it's possible to search for a specified Oyster
card chip in the neighbourhood by stepping up the power of a detector. It's
done on RF so it's not totally impossible that all you would need to do to
find one is have a suitably sensitive detector and then it wouldn't matter
whether someone used the card.

I'm guess its something like an RFID, and we all know how bad those are