Approximately 4 million to 5.5 million unauthorized immigrants in the U.S. entered the country legally on a temporary basis but then overstayed their authorized periods of admission, referred to as overstays. This book examines the extent to which the Department of Homeland Security (DHS) takes action to address overstays and its reported results. Additionally, as of January 2012, more than 850,000 active foreign students were in the U.S. enrolled at over 10,000 U.S. schools. The U.S. Immigration and Customs Enforcement agency (ICE) is responsible for managing the Student and Exchange Visitor Program (SEVP) and certifying schools to accept foreign students. This book also examines ICE's fraud prevention and detection procedures for SEVP, and the extent to which ICE has identified and assessed risks and developed policies and procedures to prevent and detect fraud during the initial school certification process and once schools begin accepting foreign students.