'Tag' system for police officers / BBC, 11 April 2008
http://news.bbc.co.uk/1/hi/england/london/7342006.stm
"The movements of every Metropolitan (Met) police officer could soon be monitored with a £2.2m tracking system. The Automated Personal Location System (APLS) would use police radios to pin-point the exact location of officers on duty in London. "