At a law enforcement equipment exhibition in Beijing last week, firms displayed AI devices that assess suspects' physical health, mental state and risk levels.
Tianjin-based video surveillance supplier Tiandy presented a camera that measures vital signs including heart rate, blood pressure, blood oxygen level and blood flow rate for up to six people in about 10 seconds. The company said accuracy exceeded 90 per cent. Results appear on a screen with abnormal indicators highlighted in yellow or red. Tiandy said the product suits interrogation waiting areas where four cameras can cover two dozen people. The technology can also track detainees' live location, warn of sudden medical crises and flag irregular policing such as leaving a detainee unattended or interrogating with only one officer present.