Wuhan Researcher Accused of Smuggling Biological Material Pleads No Contest

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The researcher allegedly tried to conceal the content of her shipments, describing one of them as a ‘picture game,’ court documents show.

A Chinese researcher accused of smuggling biological materials into a U.S. university lab has pleaded no contest to four charges.

Han Chengxuan, a doctoral candidate from the Chinese city of Wuhan who sent multiple packages containing concealed biological materials, pleaded to three smuggling charges and to lying to U.S. customs officials, the U.S. attorney for the Eastern District of Michigan announced.

Han is studying at the College of Life Science and Technology in the Huazhong University of Science and Technology in Wuhan and has co-authored two articles relating to the use of roundworms, known scientifically as C. elegans. She told federal agents that she arrived at the Detroit Metropolitan Airport on a J1 visa in June, intending to start a one-year research project at a University of Michigan lab.

Han estimates that she has sent between five and 10 packages, with several lost on the way, according to the federal complaint.  

U.S. customs intercepted four such shipments between September 2024 and March 2025, addressed to individuals associated with a University of Michigan laboratory with content varying from plasmids—DNA fragments often used to induce genetic modification of organisms—and petri dishes for growing earthworms, the court filing said.

She is the third Chinese researcher facing charges over smuggling materials for biological research. The other two, the Justice Department alleged, attempted to smuggle in a crop-killing fungus for research use at the University of Michigan.

Prosecutors alleged that Han made repeated efforts to mask her actions both while shipping the goods and while speaking with the interrogators.

During an interview with customs agents upon arrival, she initially denied knowledge about sending anything to one recipient until officers brought up specific packages, the complaint stated.

A transcript of the conversation showed that Han described the petri dishes as a water solution containing sodium oxide and sugar, stating: “These ingredients exist in fruit jelly.”

By Eva Fu

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