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 raises the possibility of Chinese espionage.

https://www.cbc.ca/news/canada/manitoba/winnipeg-lab-security-experts-1.6059097