Federal authorities arrested another University of Michigan scholar from China this week, revealing an alarming pattern of potential national security threats.

Chengxuan Han is facing federal charges for attempting to smuggle biological material into the United States, according to a criminal case filed Monday and reviewed by the Detroit News .

'The American taxpayer should not be underwriting a (People's Republic of China)-based smuggling operation at one of our crucial public institutions.'

Han is pursuing a doctorate at the College of Life Science and Technology in the Huazhong University of Science and Technology in Wuhan, China, and was invited to participate in a visiting scholar program at UM.

From September to March, while in China, she allegedly mailed four packages contai

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