U.S. Customs and Border Protection in the context of "Canada–United States border"

The Ronald Reagan Building and International Trade Center, named after former United States president Ronald Reagan, is located in downtown Washington, D.C., and was the first federal building in Washington designed for both governmental and private sector purposes. It is the second largest federal building after the Pentagon At the time it was built, the Ronald Reagan Building was the most expensive federal building ever constructed, at a cost of $768 million.

Each of the organizations located in the Pennsylvania Avenue building are dedicated to international trade and global relations. Organizations headquartered in this building include U.S. Customs and Border Protection (CBP), and the Woodrow Wilson International Center for Scholars. The U.S. Agency for International Development (USAID) was a tenant for many years until November, 2025, when it was no longer an independent agency. The first private sector lease was signed with investment banking firm Quarterdeck Investment Partners, Inc. The building hosts conferences, trade shows, cultural events, and outdoor concerts. Post-9/11, security requirements for high-profile federal buildings have limited the amount of public access anticipated by the center's designers.

The federal government of the United States empowers a wide range of federal law enforcement agencies (informally known as the "Feds") to maintain law and public order related to matters affecting the country as a whole.

While the majority of federal law enforcement employees work for the Department of Justice and Homeland Security, there are dozens of other federal law enforcement agencies under the other executive departments, as well as under the legislative and judicial branches of the federal government.

A SWAT (Special Weapons and Tactics) team is a generic term for a police tactical unit within the United States, though the term has also been used by other nations.

SWAT units are generally trained, equipped, and deployed to resolve "high-risk situations", often those regular police units are not trained or equipped to handle, such as shootouts, standoffs, raids, hostage-takings, and terrorism. SWAT units are equipped with specialized weapons and equipment not normally issued to regular police units, such as automatic firearms, high-caliber sniper rifles, stun grenades, body armor, ballistic shields, night-vision devices, and armored vehicles, among others. SWAT units are often trained in special tactics such as close-quarters combat, door breaching, crisis negotiation, and de-escalation.

The United States Border Patrol (USBP) is a federal law enforcement agency under the United States Customs and Border Protection (CBP) and is responsible for securing the borders of the United States. According to its website as of 2022, its mission is to "Protect the American people, safeguard our borders, and enhance the nation’s economic prosperity."

With 19,648 agents in 2019, the Border Patrol is one of the largest law enforcement agencies in the United States. For fiscal year 2017, Congress enacted a budget of $3,805,253,000 for the Border Patrol.

The United States government detains immigrants under the control of Customs and Border Protection (CBP; principally the Border Patrol) and the Immigration and Customs Enforcement (ICE).

According to the Global Detention Project, the United States possesses the largest immigration detention system in the world. As of 2020, ICE detains immigrants in over 200 detention facilities, in state and local jails, in juvenile detention centers, and in shelters. Immigrants may be detained for unlawful entry to the United States, when their claims for asylum are received (and prior to release into the United States by parole), during the process of immigration proceedings, undergoing removal from the country, or if they are subject to mandatory detention.

The Drug Enforcement Administration (DEA) is a United States federal law enforcement agency under the U.S. Department of Justice tasked with combating illicit drug trafficking and distribution within the U.S. It is the lead agency for domestic enforcement of the Controlled Substances Act, sharing concurrent jurisdiction with the Federal Bureau of Investigation and U.S. Customs and Border Protection. The DEA is responsible for coordinating and pursuing U.S. drug investigations both domestically and internationally.

It was established in 1973 as part of the U.S. government's war on drugs. The DEA has an intelligence unit that is also a member of the U.S. Intelligence Community. While the unit is part of the DEA chain-of-command, it also reports to the director of national intelligence. The DEA has been criticized for scheduling drugs that have medicinal uses, and for focusing on operations that allow it to seize money rather than those involving drugs that cause more harm.

A chop shop is a business, often mimicking a body shop, that illicitly sells stolen motor vehicles or their parts for profit. Chop shops are often linked to car-theft rings as part of a broader organized crime enterprise.

In the United States, the federal Motor Vehicle Theft Law Enforcement Act of 1984 and Federal Anti-Car Theft Act of 1992, as well as U.S. Department of Transportation regulations issued under those acts, require automobile manufacturers to label many different auto components (with some exemptions for new automobiles with select anti-theft systems). Chop shop operators attempt to bypass these measure by modifying vehicle identification numbers or by falsifying the paperwork needed to make a legal sale (e.g. bill of sale, car title).A 1999 study commissioned by the U.S. Department of Justice's National Institute of Justice estimated that parts marking reduced the rate of professional car theft (with "between 33 and 158 fewer cars" being "stolen by professional thieves per 100,000 cars that were marked between 1987 and 1995"), the degree to which this inhibits chop shop operations is unclear.

In law enforcement, a manhunt is a systematic search for a criminal.

A manhunt is conducted when the suspect believed to be responsible for a serious crime is at large and is believed to be within a certain area. Any police units within reach of the area will then participate in the search, each covering parts of the area. If possible, the officers will form a perimeter around the area, guarding any and all possible escape routes from the containment.