Charges Dropped Against 3 Chinese Scientists in Michigan Smuggling Case

China's government intervened to get the case dismissed, lawyers say

Published on Feb. 25, 2026

Got story updates? Submit your updates here. ›

Charges have been dropped against three Chinese scientists at the University of Michigan who were accused of helping a colleague smuggle biological materials into the U.S. Lawyers say China's government intervened and negotiated with U.S. officials to get the case dismissed, as the materials turned out to be mostly harmless transparent worms.

Why it matters

The case highlights tensions around scientific collaboration between the U.S. and China, as well as concerns over the prosecution of foreign researchers. The dismissal raises questions about the strength of the original charges and the role of diplomatic pressure in resolving the case.

The details

Xu Bai, Fengfan Zhang, and Zhiyong Zhang were charged with conspiring to help another scientist, Chengxuan Han, ship packages containing biological materials from China before she arrived in the U.S. for temporary lab research at the University of Michigan. Han pleaded no contest to smuggling and making false statements and was deported. The three scientists were jailed for over 3 months before the charges were suddenly dismissed at the Justice Department's request, with lawyers saying the Chinese Consulate intervened.

  • In September 2025, Chengxuan Han pleaded no contest to smuggling and making false statements and was deported to China after 3 months in jail.
  • In a separate case, Yunqing Jian, another temporary researcher, pleaded guilty to similar charges involving a common plant fungus and was deported after 5 months in custody.
  • On February 5, 2026, a judge dismissed the charges against Xu Bai, Fengfan Zhang, and Zhiyong Zhang at the Justice Department's request, and the three traveled home to China.

The players

Xu Bai

One of the three Chinese scientists charged in the Michigan smuggling case.

Fengfan Zhang

One of the three Chinese scientists charged in the Michigan smuggling case.

Zhiyong Zhang

One of the three Chinese scientists charged in the Michigan smuggling case, who was accused of making false statements.

Chengxuan Han

The scientist who shipped packages containing biological materials from China before arriving in the U.S. for temporary lab research at the University of Michigan.

Yunqing Jian

Another temporary researcher at a campus lab who pleaded guilty to similar charges involving a common plant fungus and was deported.

Got photos? Submit your photos here. ›

What they’re saying

“The dismissal came as a pleasant surprise. We don't know the details. What we were told was there was some kind of intervention by the Chinese Consulate in Chicago.”

— John Minock, Defense lawyer

“We get this phone call saying China is negotiating with the U.S. over these three students. Serious talks. These were kids studying for their Ph.D.s. The last thing you want to do is destroy their careers. ... Was it the proper thing to do? Absolutely.”

— Ray Cassar, Defense lawyer

“The Chinese Consulate 'getting involved moved the needle.' I was planning to seek dismissal of the false statements charge, noting that Zhiyong Zhang, who spoke Mandarin, didn't have a translator when he was questioned by investigators.”

— Mark Satawa, Defense attorney

What’s next

The U.S. Attorney's Office in Detroit said it would not comment on China's role or the government's retreat in the case.

The takeaway

This case highlights the delicate balance between national security concerns and scientific collaboration, as well as the potential influence of diplomatic pressure in resolving disputes involving foreign researchers. It raises questions about the strength of the original charges and the appropriate handling of such cases going forward.