Couple shared information, virus samples from high-security lab with Chinese institute. China says its scientific co-operation with Canada should not be politicized, responding to questions about two scientists fired from Canada’s only Level 4 lab — a case that has led to an RCMP investigation, demands for details in Parliament and concerns about Chinese espionage. Very few people know why Dr. Xiangguo Qiu and her biologist husband, Keding Cheng, were marched out of the Winnipeg-based National Microbiology Lab (NML) two years ago and stripped of their security clearance. They were officially fired last January. However, two national security experts believe the case of the scientists raise the possibility of Chinese espionage.