Steve Chapman on the Rush to Embrace Surveillance Cameras

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Video surveillance cameras have been growing in popularity for years, but in recent weeks their advance has gotten a turbo boost. After helping to identify two suspects in the Boston Marathon bombings, they went from occasionally desirable to universally vital. There is no doubt that the cameras were a big help this time. But that doesn't mean they are generally a good idea, writes Steve Chapman, much less a crucial tool in fighting terrorism and crime.

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