Three scientists were charged in worm smuggling scheme, lawyers say China helped get case dismissed

China’s government intervened and helped get charges dropped against three Chinese scientists at the University of Michigan who were accused of helping a colleague smuggle biological materials into the U.S., defence lawyers said.

The materials turned out to be mostly tiny, transparent worms — nothing dangerous — though U.S. officials last year hailed the arrests as a victory for national security.

Attorney General Pam Bondi said the government must be vigilant when foreign nationals try to “advance a malicious agenda.” Xu Bai and Fengfan Zhang were charged with conspiring to help another scientist who shipped packages to them from China before she arrived in 2025 for temporary lab research at the University of Michigan. A third man, Zhiyong Zhang, was charged with making false statements to authorities.

Bai, Zhang and Zhang were in jail for more than three months while the case was pending in federal court in Detroit. A judge suddenly dismissed the charges on Feb 5 at the Justice Department’s request and the three traveled home to China.

The U.S. Attorney’s Office in Detroit said it would not comment on China’s role or the government’s retreat. An email seeking comment from the Chinese Consulate in Chicago was not immediately answered Wednesday.

“The dismissal came as a pleasant surprise,” defence lawyer John Minock said. “We don’t know the details. What we were told was there was some kind of intervention by the Chinese Consulate in Chicago.”

Another attorney, Ray Cassar, said lawyers were working toward a misdemeanour plea deal to resolve the case when prosecutors simply dropped it.

“We get this phone call saying China is negotiating with the US over these three students. Serious talks,” Cassar said. “These were kids studying for their PhDs. The last thing you want to do is destroy their careers. … Was it the proper thing to do? Absolutely.”

Bai, Zhang and Zhang were research scholars admitted to the US to temporarily work at the University of Michigan.

Mr. Cassar said the worms had a limited lifespan. The packages, he added, were not properly labelled because Chengxuan Han, the woman who sent them, likely didn’t want to have them held up by U.S. inspectors.

“There was no intention of doing anything nefarious,” Mr. Cassar said. “The worms have been consistently used for studying chemical reactions, light sensitivity.”

In September, Han pleaded no contest to smuggling and making false statements and was deported to China after three months in jail. In a separate case, Yunqing Jian, another temporary researcher at a campus lab, pleaded guilty to similar charges involving a common plant fungus. She was deported after five months in custody.

Roger Innes, an Indiana University expert who looked at the evidence for Jian’s attorneys, said there was no risk to anyone in the U.S..