DETROIT — Federal agents have arrested a University of Michigan scholar from China on charges she tried to smuggle a biological pathogen into the U.S. characterized as a potential agricultural terrorism weapon that can be used for targeting food crops. The FBI counterintelligence case against UM scholar Yunqing Jian, 33, and her boyfriend, 34-year-old Zunyong Liu, was unsealed in federal court in Detroit on Tuesday and marks the second time in less than a week a Chinese national with ties to the university has been charged with federal crimes. On Friday, prosecutors unsealed a criminal case against a former University...