State media yesterday confirmed the detention of Chinese Academy of Social Sciences (CASS) academic Zheng Jiadong , the third member of the leading social think-tank held in three months. Quoting Ge Liangzhi , party secretary of the CASS' Institute of Philosophy, the Beijing Times reported that Mr Zheng, a Confucian researcher, was put under criminal detention while completing immigration procedures to leave the country on June 10. After being held for seven days by the Exit-Entry Administration of the Beijing municipality public security bureau, he has been transferred to the bureau itself. The Beijing Times, affiliated to the state-run People's Daily, reported that police had conducted investigations at Mr Zheng's home. It quoted Mr Ge as saying the investigation period was expected to last for 37 days from the date of arrest, and that police would notify the academy of the results. The report also cited a report on Chinanewsnet alleging Mr Zheng was using his visiting scholar status to help women move to the US. In an earlier report, Chinanewsnet claimed that the US immigration tipped off Chinese police. It is claimed Mr Zheng visited the US with a different 'wife' six times, but the women did not return to China with him. They have all since been found overstaying their visas. Mr Zheng is the academy's head of Chinese philosophy. His research area and interests include comparative philosophy - especially Confucian philosophy and its history. He has been a visiting scholar at many institutes, including Harvard, the University of Toronto and the University of Tokyo, and given lectures in the United States.