Judge says 3 months in jail are enough for Chinese scientist in US smuggling case

FILE - This photo provided by the Sanilac County, Mich., Sheriff's Office on Friday, June 13, 2025, shows Chinese scientist Chengxuan Han. (Sanilac County Sheriff's Office via AP, file)
FILE - This photo provided by the Sanilac County, Mich., Sheriff's Office on Friday, June 13, 2025, shows Chinese scientist Chengxuan Han. (Sanilac County Sheriff's Office via AP, file)
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A young Chinese scientist who’s been in jail for three months will be returning to China. A judge in Detroit says no additional jail time is necessary for Chengxuan Han. She pleaded no contest to illegally shipping biological material to the U.S. before arriving for a job at the University of Michigan. The material wasn’t hazardous, but the government says the packages were not properly labeled and that Han didnโ€™t have approval to ship them. Han says it’s been a โ€œvery painfulโ€ lesson and that her career is โ€œdestroyed.โ€

DETROIT (AP) โ€” A young Chinese scientist interrogated for hours after an international flight to Detroit and held in jail for three months was sentenced to time served Wednesday for illegally shipping biological material to the U.S. that nonetheless wasn't a threat to the public.

U.S. District Judge Matthew Leitman acknowledged that federal agents have a critical role in stopping โ€œbad actorsโ€ from trying to get โ€œbad stuffโ€ into the country. But he also noted that Chengxuan Han, who was headed to a one-year job at a University of Michigan lab, doesn't appear to fit that category.

โ€œThatโ€™s the appropriate balance to strike here,โ€ the judge said in declining to keep Han locked up for another three months as the government had suggested.

Han cried as she spoke to the judge in Mandarin and expressed regret for a โ€œvery painfulโ€ lesson. She said her career will be โ€œdestroyedโ€ when she soon returns to China.

โ€œGovernment agents are doing their duties here. … I really have no intention to harm anybody and create a security hazard,โ€ Han said through a translator.

The U.S. Attorney's Office in Detroit has used unflattering language in promoting the case against Han, even referring to her as an โ€œalien from Wuhan,โ€ a Chinese city that became notorious as the possible source for the global spread of COVID-19.

Han is โ€œnot some sort of Chinese operative,โ€ defense attorney Sara Garber said in a court filing, describing her as a โ€œnerdy, kind and polite academic.โ€

Han, who is in her late 20s, pleaded no contest to smuggling and making false statements. Before her arrival in the U.S., authorities said she made three shipments to someone in Ann Arbor, Michigan, including a book with a hidden envelope that contained filter paper with 28 shapes containing plasmids, which are found naturally in bacteria.

โ€œHello! This is a fun letter with interesting patterns. I hope you can enjoy the pleasure within it,โ€ Han wrote.

Han was also accused of sending petri dishes that contained nematode worms, known as C. Elegans. Authorities said the packages were not properly labeled and that Han didn't have approval to ship them.

โ€œC. Elegans is easy to obtain, easy to study, nonharmful,โ€ Garber said.

She said Han's research focuses on how organisms detect light, touch and temperature.

โ€œThis is not a case of smuggling in some sort of virus or a crop-destroying something or other,โ€ the judge said. โ€œFrom what I can tell, this material was not a threat at all."

Han's case is one of two involving Chinese scientists and the University of Michigan. Yunqing Jian is charged with conspiring with her boyfriend, another scientist from China, to bring a toxic fungus into the U.S. Fusarium graminearum can attack wheat, barley, maize and rice.

It is already found in the East and Upper Midwest, and scientists have been studying it for decades. Jian's case is pending.

3 months in jail is punishment enough for Chinese scientist in smuggling case, US judge says

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