In 2005, the first national procuratorial organ selected outstanding case handlers.

Mao, who was then the deputy director of the investigation room 1 of the anti-corruption bureau of Hunan Provincial Procuratorate, was selected as the first outstanding investigator. This person was selected for undertaking a series of important cases, such as the bribery case of Wang Daosheng, deputy secretary-general of the provincial government, Yang Zhida, director of the provincial senior management bureau, and Wu Zhenhan, president of the provincial high court. The list can't be found.