This already has happened in Boston. http://joshuamcginnis.com/2008/08/09/wow-how-to-hack-boston-mbta-cards-for-under-15/ http://joshuamcginnis.com/2008/08/09/

This already has happened in Boston. http://joshuamcginnis.com/2008/08/09/wow-how-to-hack-boston-mbta-cards-for-under-15/ http://joshuamcginnis.com/2008/08/09/wow-how-to-hack-boston-... It's really shocking that people think storing MONEY on a card that everyone has read/write access to is a GOOD idea.