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Federal
At the federal level, there exists both federal police, who possess full federal authority as given to them under United States Code (U.S.C.), and federal law enforcement agencies, who are authorized to enforce various laws at the federal level. Both police and law enforcement agencies operate at the highest level and are endowed with police roles; each may maintain a small component of the other (for example, the FBI Police). The agencies have nationwide jurisdiction for enforcement of federal law. Most federal agencies are limited by the U.S. Code to investigating only matters that are explicitly within the power of the federal government. However, federal investigative powers have become very broad in practice, especially since the passage of the USA PATRIOT Act. There are also federal law enforcement agencies, such as the United States Park Police, that are granted state arrest authority off primary federal jurisdiction.

The Department of Justice (DOJ) is responsible for most law enforcement duties at the federal level. It includes the Federal Bureau of Investigation (FBI), the Drug Enforcement Administration (DEA), the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF), the United States Marshals Service, the Federal Bureau of Prisons (BOP) and others.

The Department of Homeland Security (DHS) is another branch with numerous federal law enforcement agencies reporting to it. U.S. Customs and Border Protection (CBP), U.S. Immigration and Customs Enforcement (ICE), United States Secret Service (USSS), United States Coast Guard (USCG), and the Transportation Security Administration (TSA) are some of the agencies that report to DHS. It should be noted that the United States Coast Guard is assigned to the United States Department of Defense in the event of war.

At a crime or disaster scene affecting large numbers of people, multiple jurisdictions, or broad geographic areas, many police agencies may be involved by mutual aid agreements. For example the United States Federal Protective Service responded to the Hurricane Katrina natural disaster. Command in such situations remains a complex and flexible issue.

In accordance with the federal structure of the United States government, the national (federal) government is not authorized to execute general police powers by the Constitution of the United States of America. The power to have a police force is given to each of the United States' 50 federated states. The US Constitution gives the federal government the power to deal with foreign affairs and interstate affairs (affairs between the states). For policing, this means that if a non-federal crime is committed in a US state and the fugitive does not flee the state, the federal government has no jurisdiction. However, once the fugitive crosses a state line he violates the federal law of interstate flight and is subject to federal jurisdiction, at which time federal law enforcement agencies may become involved.