Since 9/11, the United States has had the most organized and carefully managed refugee admissions process in the world. After screening by the United Nations High Commissioner for Refugees (UNHCR), the U.S National Counterterrorism Center, the FBI Terrorist Screening Center, and the Departments of State, Defense, and Homeland Security vet all refugees seeking resettlement in the U.S. U.S. security agencies have complete control over who is, and who is not, admitted to the country as a refugee, and ensure compliance with the Patriot Act and other U.S. laws restricting admission of anyone associated with terrorism.