Even if you have never set foot in China, Hikvision's cameras have likely seen you. By 2017, Hikvision had captured 12 percent of the North American market. Its cameras watched over apartment buildings in New York City, public recreation centers in Philadelphia, and hotels in Los Angeles. Police departments used them to monitor streets in Memphis, Tennessee, and in Lawrence, Massachusetts. London and more than half of Britain's 20 next-largest cities have deployed them. A recent search for the company's cameras, using Shodan, a tool that locates internet-connected devices, yielded nearly 5 million results, including more than 750,000 devices in the United States. Among the policies that Hikvision's products have supported is China's wide-ranging crackdown against the predominantly Muslim Uyghurs and other minority groups in the western province of Xinjiang. Far from being appalled by Hikvision's role in China's atrocities, however, plenty of foreign leaders are intrigued. They see an opportunity to acquire tools that could reduce crime and spur growth. Of course, the authoritarian-leaning among them also see a chance to monitor their domestic challengers and cement their control. The use of military language ... heightens the sense that these tools can easily become weapons. Cameras can be set to "patrol." "Intrusion detection" sounds like a method for defending a bank or a military base. Hikvision's cameras do not check identities. They "capture" faces.