Chinese authorities have begun deploying a new surveillance tool designed to identify people by how they walk, or the shapes of their body. Adding to the already staggering number of surveillance cameras — many of which use bleeding edge optics and facial recognition technologies — China is already using the tool on the streets in its two largest cities, Beijing and Shanghai.

It, again, raises concern among privacy advocates about how far the government is willing to go to keep tabs on its citizens. Huang Yongzhen, CEO of Watrix, the company that designed the system, says it can identify people…

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