WASHINGTON, Oct. 4 -- Tufts Medicine, Burlington, Massachusetts, has submitted a public comment letter to the U.S. Department of Homeland Security (DHS) expressing serious concerns regarding proposed changes to the admission and extension procedures for nonimmigrant academic students, exchange visitors, and representatives of foreign information media. The proposed rule would alter visa status for individuals holding F and J visas, which play a crucial role in supporting the academic and healthc more ST