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The streets of London are monitored by 10,524 CCTV cameras. One camera for every 714 people may sound like a lot, and the city has spent over $400 million in an effort to cut down on crime. Only it hasn't exactly worked. Despite Big Brother watching, essentially, every street corner, the London police are still letting four out of five crimes go unsolved. And worse yet, there seems to be no correlation between the density of cameras and the crime-solving rate.