Facial-recognition technology enables governments and private enterprise to track citizens anywhere there is a camera, even if they’re not carrying any devices. It’s a stark example of a technology that is being deployed faster than society and the law can adopt new norms and rules, writes Christopher Mims.

Facial-recognition technology enables governments and private enterprise to track citizens anywhere there is a camera, even if they’re not carrying any devices. It’s a stark example of a technology that is being deployed faster than society and the law can adopt new norms and rules, writes Christopher Mims.