The system of external video surveillance, working in London, is called "Orwellian" and critically inefficient: only 2% of the cases of comparison of camera images with databases proved to be reliable.
Face Detection program installed on the servers of Scotland Yard, gives 98% of false alerts about the coincidence of personalities of people caught on surveillance cameras with databases of criminal elements. Leading experts in biometrics recognized it as "completely unfit for use."
In response to journalists' requests under the Freedom of Information Act, Scotland Yard provided statistical data, from which it follows that of the 104 cases of positive response of the system, in only two cases the camera record and the database showed indeed the same person. The police refuse to call it "false operation", insisting that when receiving a signal, experts in any case view the data themselves.
The program of video recording and face recognition is used at major public events, for example, at Carnival in Notting Hill and at the Six Rugby Nations Match.