Bluetooth is watching: secret study gives Bath a flavour of Big Brother / July 21 2008

http://www.guardian.co.uk/uk/2008/jul/21/civilliberties.privacy?gusrc=rss&feed=uknews

"Tens of thousands of Britons are being covertly tracked without their consent in a technology experiment which has installed scanners at secret locations in offices, campuses, streets and pubs to pinpoint people's whereabouts. The scanners, the first 10 of which were installed in Bath three years ago, are capturing Bluetooth radio signals transmitted from devices such as mobile phones, laptops and digital cameras, and using the data to follow unwitting targets without their permission."