For the Taiwanese professor, detecting the hidden cameras before his lectures enabled him to exercise caution and spared him the trouble that befell several Chinese professors in recent years.
To cite just a couple of many recent examples: In August, the Chinese police broke into the home of a retired professor, Sun Wenguang, in the eastern province of Shandong, while he was in the middle of a live phone interview with the Voice of America and criticized China’s spending abroad. The police abruptly yanked him off the air and took him away. Mr. Sun then disappeared. In July, there were reports that a university in the southeastern city of Xiamen fired a veteran professor of international trade and economics for making what university officials vaguely described as “radical” statements in class.