Ai Weiwei, a Chinese artist and activist, has been tracking criminals in public places using face recognition technology. In the past few years, he has been monitoring the activities of criminals such as fugitives and rapists in different cities across China. His project aims to raise awareness about public safety issues and promote the use of new technologies to help law enforcement agencies track down criminals. Ai Weiwei also uses social media to spread his findings and engage with the public. While there may be concerns about privacy, Ai Weiwei insists that he only tracks individuals who have been accused or convicted of crimes in court. He believes that this technology can help improve public safety and prevent future offenses from occurring.