A federal judge in Southern California has revoked the U.S. citizenship of two former research scientists accused of stealing medical trade secrets and funneling them to China, cutting off the protections they gained through naturalization. The order strips Li Chen and her husband, Yu Zhou, of their adopted status after prosecutors said the pair hid their criminal conduct when they applied, alleging they mined proprietary exosome methods at an Ohio children’s hospital and later tried to cash in on those techniques overseas.
Judge James E. Simmons Jr. of the U.S. District Court for the Southern District of California signed the denaturalization order on March 30, according to the Tampa Free Press. The Civil Division’s Office of Immigration Litigation brought the case after an investigation that involved Homeland Security Investigations and ICE’s Office of the Principal Legal Advisor, the outlet reported.
How prosecutors say the scheme worked
According to prosecutors, Chen and Zhou used their posts at Nationwide Children’s Hospital’s Research Institute to walk off with at least five trade secrets tied to exosome isolation, then pushed products built on those methods in foreign markets, as detailed by the U.S. Department of Justice. Court documents cited in that release say the couple launched a company in China and that Chen sought support from a Chinese government talent program while monetizing an “isolation kit.”
Convictions, sentences and restitution
Chen pleaded guilty in 2020 and received a 30‑month federal prison sentence, and Zhou later drew a 33‑month sentence, according to contemporaneous reporting by the Associated Press. The couple were ordered to forfeit assets and pay roughly $2.6 million in restitution, court records and news reports show.
Why prosecutors moved to strip citizenship
Prosecutors argued that the couple’s conduct showed they lacked the "good moral character" federal law requires for naturalization and that their crimes amounted to moral turpitude, which can block lawful citizenship. The Justice Department has in recent months put fresh emphasis on denaturalization as an enforcement tool, a policy reported by OPB, and officials quoted in the denaturalization order stressed the gravity of securing citizenship after serious criminal activity. Assistant Attorney General Brett A. Shumate was cited as saying, "Naturalization is not a right, it's a privilege," and Attorney General Pamela Bondi called gaining citizenship after serious crimes "an unacceptable abuse," according to the Tampa Free Press.
What it means for hospitals and researchers
Observers say the case underscores intensifying federal scrutiny of researchers’ outside ties and the pressure on hospitals to lock down intellectual property, a concern flagged when the indictment dropped in 2019, according to reporting by VOA. Institutions handling cutting‑edge science have been tightening disclosure rules and internal audits in response to similar prosecutions, wary of both foreign‑interference allegations and the risk of losing lucrative patents.
What's next
Denaturalization wipes out a certificate of naturalization and can open the door to immigration consequences or removal if a person has no other claim to U.S. citizenship; the government must show the status was illegally obtained, as outlined in the Justice Manual. The couple can attempt to appeal the ruling; if it holds, they lose a key layer of legal protection and could face deportation proceedings or additional civil fallout, depending on what future courts decide.
