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Federal Law can be divided into three broad areas: Statutory Law, Regulatory Law, and Case Law. The Statute is the law as it is passed by Congress. Regulations are rules that govern the enforcement of particular laws. These rules are developed by the Executive branch, which includes a wide variety of Federal agencies and departments. Case laws are legal precedents that come from Federal court rulings from the Supreme Court on down to the lower federal courts. The links below will direct you to online research pages and full text of official and unofficial U.S. government sources of Federal Law.
The Federal Digital System is the primary source for full-text of Federal Documents, including laws, legislation, regulations, and information published by Congress, the Courts, and the Executive.
Search Congress.Gov for current or passed legislation.
From the U.S. Archives, the complete text of the U.S. Constitution
U.S. Code (Official)
The U.S. Code is the cumulative codification of every law passed by Congress. As laws are passed they first appear as slip laws, then in the U.S. Statutes at Large, and finally the law is codified in the U.S. Code. There are many unofficial versions of the code on the web, but this link is to the ONLY official online version of the U.S. Code.
U.S. Statutes at Large 1951-2011
The U.S. Statutes at Large are a published chronological listing of every law passed by Congress. There is a lag time in publishing. For the full text of recent laws passed, check the Public Laws (Slip Laws).
U.S. Code (Unofficial)
From the Legal Information Institute, this is a more user-friendly version of the U.S. Code online.
Full-text of all laws passed by Congressional branch since 1995, listed in chronological order by Public Law #
Federal Courts - Case Law
Code of Federal Regulations
Official version of the CFR from the Government Printing Office
A more up-to-date version of the CFR (code is updated almost daily as new regulations are finalized) that is NOT official.
Here you can track regulations as they move through the approval process, submit comments on regulations, and find information about the regulatory agendas of the various Executive agencies.