Jane Lee 1/2 Chinese staffers adjust U.S. and Chinese flags before the opening session of Sino-U.S. trade negotiations in Beijing, Feb. 14, 2019. Mark Schiefelbein/Pool via REUTERS Read More July 22 (Reuters) - The U.S. Justice Department moved on Thursday to drop all charges against a Chinese researcher arrested last year over visa fraud in its "China Initiative" that aims to prevent the transfer of U.S. technology. Tang Juan, a visiting researcher at the University of California Davis school of medicine, whose jury trial was set to start on Monday, was arrested in July last year for allegedly concealing her military affiliation.