And now a word from the BBC Big Brother Central

Pocket tracker monitors children http://news.bbc.co.uk/2/hi/technology/2946183.stm [uses triangulation not GPS, like some CALEA phones] Police consider lie detector tests http://news.bbc.co.uk/2/hi/uk_news/england/2944563.stm [its not just for the DoE http://cryptome.org/doe041403.txt though its empirically crap/psyops]