According to a much-reported survey carried out in 2002, Britain then had 4.3m closed-circuit television (cctv) cameras-one for every 14 people in the country. That figure has since been questioned, but few doubt that Britons are closely scrutinised when they walk the streets. This scrutiny is supposed to deter and detect crime. Even the government's statistics, though, suggest that the cameras have done little to reduce the worst sort of criminal activity, violence.rnThat may, however, be about to change, and in an unexpected way. It is not that the cameras and their operators will become any more effective. Rather, they have accidentally gathered a huge body of data on how people behave, and particularly on how they behave in situations where violence is in the air. This means that hypotheses about violent behaviour which could not be tested experimentally for practical or ethical reasons, can now be examined in a scientific way. And it is that which may help violence to be controlled.
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