Immigration Officers' Authority to Apprehend and Remove Aliens: Questions & Answers in Brief [February 13, 2017] [open pdf - 153KB]
"Reports that U.S. Immigration and Customs Enforcement (ICE) agents conducted enforcement actions in at least six states during the week of February 6, 2017 have raised a number of questions about agents' authority to apprehend and remove aliens. This Sidebar provides brief answers to some of these questions."
CRS Legal Sidebar, February 13, 2017
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html