http://www.theregister.co.uk/2005/04/20/privacy_groups_attack_passport_tech/
"The concerns focus on the US government's initiative to create machine-readable passports that will be rolled out to the diplomatic corps this year and to the general public starting in 2006. Privacy and security experts criticized the move as ill-considered, saying that the technology would leak data to those with specialized equipment, allowing Americans to be automatically identified by the passports they are carrying."