With the War on Terror in full swing, the government's involvement in and influence over law enforcement has changed and, in some cases, expanded. While police forces remain under the jurisdiction of the cities and states they patrol, federal agencies have taken on a wider role in combating and prosecuting crime. Agencies such as the FBI, the DEA, the ATF, and now the Department of Homeland Security have wide and varied responsibilities and powers in combating both terrorism and other crimes. But, this wasn't always the case. This timely book examines the history behind American federal law enforcement as well as its current state in all of its forms.