The Economist reports on the increasingly pervasive use of video surveillance in countries around the world. China will soon employ three million surveillance cameras--surpassing Britain--and its industry is expected to reach 500 billion yuan, or $79 billion, in 2015. Alongside the increase in video surveillance is an increase in the use of facial recognition technology, currently employed at Mexican prisons, U.S. bars, Japanese workplaces and many other locations worldwide. Brazilian police will use it to improve security at the 2014 World Cup. The U.S. National Institute of Standards and Technology has found that such technology is improving, raising legal questions about the "reasonable expectation of privacy" in public, the report states. 
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