Yup, reckon they were even caught in the act on one occasion, though MSM seem to have disappeared it down the memory hole...
Zaosong Zheng, 30, a Chinese national, was arrested on Dec. 10, 2019, at Boston’s Logan International Airport and charged by criminal complaint with attempting to smuggle 21 vials of biological research to China.
Yup, reckon they were even caught in the act on one occasion, though MSM seem to have disappeared it down the memory hole...
https://www.justice.gov/opa/pr/harvard-university-professor-and-two-chinese-nationals-charged-three-separate-china-related