Just a week later, graduate student Chengxuan Han was also arrested on charges of smuggling goods into the United States and making false statements.

Chengxuan Han was accused of bringing biological materials related to roundworms into the U.S. for her work at the school’s laboratory.

Yunqing Jian and Chengxuan Han said in separate court appearances in Detroit that they would not challenge the government's request to keep them locked up while their cases move forward.

Yunqing Jian and Chengxuan Han said in separate court appearances in Detroit that they would not challenge the government's request to keep them locked up while their cases move forward.

Chengxuan Han is accused of bringing in biological materials related to roundworms in a case in federal court in Detroit.