Prometheus 6

Once a person is being monitored, pattern-recognition software first identifies their typical behaviour, such as repeated calls to certain numbers over a period of a few months. The software can then identify any deviations from the norm and flag up unusual activities, such as transactions with a foreign bank, or contact with someone who is also under surveillance, so that analysts can take a closer look.

However, it is far from clear whether the technology will prove accurate. Security experts warn that data-fusion technologies tend to produce a huge number of false positives, flagging up perfectly innocent people as suspicious...."If you're looking for burglars in a run-down district where 50 per cent of men have a criminal conviction, you may find plenty. But if you're trying to find terrorists among airline passengers - where they are extremely rare - then almost all your hits will be false."

Surveillance made easy
09:00 23 August 2008
NewScientist.com news service
Laura Margottini

"THIS data allows investigators to identify suspects, examine their contacts, establish relationships between conspirators and place them in a specific location at a certain time."

So said the UK Home Office last week as it announced plans to give law-enforcement agencies, local councils and other public bodies access to the details of people's text messages, emails and internet activity. The move followed its announcement in May that it was considering creating a massive central database to store all this data, as a tool to help the security services tackle crime and terrorism.