Crime is ordinarily proscribed, tried, and punished according to the laws of the place where it occurs. American criminal law applies beyond the geographical confines of the United States, however, under certain limited circumstances. A surprising number of federal criminal statutes have extraterritorial application, but prosecutions have been few. This may be because when extraterritorial criminal jurisdiction does exist, practical and legal complications, and sometimes diplomatic considerations, may counsel against its exercise.

The increased presence of foreign students in graduate science and engineering programs and in the scientific workforce has been and continues to be of concern to some in the scientific community. Enrollment of U.S. citizens in graduate science and engineering programs has not kept pace with that of foreign students in those programs. In addition to the number of foreign students in graduate science and engineering programs, a significant number of university faculty in the scientific disciplines are foreign, and foreign doctorates are employed in large numbers by industry. This report explains this issue in detail, as well as probable causes of said incongruity.

"Extradition" is the formal surrender of a person by a State to another State for prosecution or punishment. Extradition to or from the United States is a creature of treaty. The United States has extradition treaties with over a hundred of the nations of the world. International terrorism and drug trafficking have made extradition an increasingly important law enforcement tool. This is a brief overview of federal law in the area and of the adjustments in recent treaties to make them more responsive to American law enforcement interests.

This report discusses the visa security and visa policy questions debated in Congress. The policy questions center on whether immigration law needs to be strengthened, whether funding should be increased, and which agency should take the lead.

The Foreign Intelligence Surveillance Act (FISA) provides a statutory framework by which government agencies may, when gathering foreign intelligence investigation, obtain authorization to conduct electronic surveillance or physical searches, utilize pen registers and trap and trace devices, or access specified business records and other tangible things. This report discusses three sunsetting amendments of FISA which include the "Lone Wolf" provision, "roving" wiretaps, and access to business records.

This report provides an overview of Arctic-related issues for Congress, and refers readers to more in-depth CRS reports on specific Arctic-related issues.

The United States and Soviet Union signed the Strategic Arms Reduction Treaty in 1991; it entered into force in December 1994 and expired in December 2009. This report provides background information about the START Treaty and reviews the discussions about a possible successor to START. It also presents a range of alternatives that the United States and Russia might consider if they choose to follow START with a new framework for the arms control process.

This document provides a U.S.-centric chronology of the international policy deliberations to address climate change from 1979-2009. It begins before agreement on the United Nations Framework Convention on Climate Change (UNFCCC) in 1992, and proceeds through the Kyoto Protocol in 1997, the Marrakesh Accords of 2001, the Bali Action Plan of 2007, and the Copenhagen conference in 2009.

This report summarizes U.S. assistance to the Democratic People's Republic of North Korea (DPRK, also known as North Korea). It will be updated periodically to track changes in U.S. provision of aid to North Korea.

The United States and Soviet Union signed the Strategic Arms Reduction Treaty in 1991; it entered into force in December 1994 and expired in December 2009. This report provides background information about the START Treaty and reviews the discussions about a possible successor to START. It also presents a range of alternatives that the United States and Russia might consider if they choose to follow START with a new framework for the arms control process.

This report offers background information on Ukraine's current political and economic situation. It also discusses U.S. policy, U.S. aid to Ukraine, the congressional response, and related legislation.

This report discusses the reasons that Iran is considered a threat to U.S. security, including Iran's nuclear program, involvement with terrorist organizations, and involvement with neighboring countries' local governments. The report also discusses ways which the U.S. hopes to modify Iran's behavior with sanctions, and the effectiveness of these sanctions.

This report discusses the current political state of Afghanistan, as well as the Afghan government. This report also discusses Afghanistan's relationship with the United States, particularly U.S. efforts to urge President Hamid Karzai to address corruption within the Afghan government.

This report examines the Organization for Economic Cooperation and Development (OECD) and its role in changes to U.S. laws related to bribery, tax havens.

This report summarizes U.S. energy, food and medical assistance to the Democratic People's Republic of North Korea (DPRK, also known as North Korea).

This report provides a primer on the confluence of transnational terrorist and criminal groups and related activities abroad. It evaluates possible motivations and disincentives for cooperation between terrorist and criminal organizations, variations in the scope of crime-terrorism links, and the types of criminal activities--fundraising, material and logistics support, and exploitation of corruption and gaps in the rule of law--used by terrorist organizations to sustain operations.

This report provides a brief historical background of Chile, examines recent political and economic developments, and addresses issues in U.S.-Chilean relations.

This report collects statistics from a variety of sources on casualties sustained during Operation Enduring Freedom (OEF), which began on October 7, 2001. OEF actions took place primarily in Afghanistan; however, OEF casualties also includes American casualties in Pakistan, Uzbekistan, Guantanamo Bay (Cuba), Djibouti, Eritrea, Ethiopia, Jordan, Kenya, Kyrgyzstan, the Philippines, Seychelles, Sudan, Tajikistan, Turkey, and Yemen.

This report collects statistics from a variety of sources on casualties sustained during Operation Enduring Freedom (OEF), which began on October 7, 2001. OEF actions took place primarily in Afghanistan; however, OEF casualties also includes American casualties in Pakistan, Uzbekistan, Guantanamo Bay (Cuba), Djibouti, Eritrea, Ethiopia, Jordan, Kenya, Kyrgyzstan, the Philippines, Seychelles, Sudan, Tajikistan, Turkey, and Yemen.

This report discusses attempts to resolve the Cyprus problem and reunify the island which have undergone various levels of negotiation for almost 40 years. Prospects for a settlement that would end the political division of Cyprus appear to have reached a stalemate and may now enter a period of retrenchment possibly dominated by harder-line views by both sides and more difficult negotiations.

The U.S. program of assistance to Afghanistan is intended to stabilize and strengthen the Afghan economic, social, political, and security environment so as to blunt popular support for extremist forces in the region. Since 2001, nearly $47 billion has been appropriated toward this effort. This report provides a "big picture" overview of the U.S. aid program and congressional action. It describes what various aid agencies report they are doing in Afghanistan. It does not address the effectiveness of their programs.

The Navy has begun a multi-billion dollar program to modernize its 84 existing Aegis cruisers and destroyers over a period of more than 20 years. This report explores this program in detail, including the reasons for the program and the oversight issues it poses for Congress.

This report provides overview information on the proposed FY2011 budget request for the Department of Homeland Security (DHS) programs that provide assistance to state and local governments. These programs are primarily used by first responders -- including firefighters, emergency medical personnel, emergency managers, and law enforcement officers -- to provide assistance for training, exercises, the purchase of equipment, and other support for terrorism and disaster preparedness and response activities.

This report provides an overview of nanotechnology, the National Nanotechnology Initiative, possible reauthorization of the 21st Century Nanotechnology Research and Development Act of 2003 (P.L. 108-153), and appropriations issues.