Most of the Department's law enforcement agencies such as the U.S. Customs Service, the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), and the U.S. Secret Service were reassigned to other departments in 2003 in conjunction with the creation of the Department of Homeland Security.
Størstedelen af ministeriets tjenester indenfor lovhåndhævelse, såsom ATF, toldtjenesten og United States Secret Service blev omstruktureret til andre ministerier i 2003 i forbindelse med oprettelsen af Home land Security.