The Immigration and Nationality Act (INA) authorizes-and in some cases requires-the Department of Homeland Security (DHS) to detain non-U.S. nationals (aliens) arrested for immigration violations that render them removable from the United States. An alien may be subject to detention pending an administrative determination as to whether the alien should be removed, and, if subject to a final order of removal, pending efforts to secure the alien's removal from the United States. The immigration detention scheme is multifaceted, with different rules that turn on several factors, such as whether...