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In the Federal process, after hearings in committees, and discussions on the floors of the House and Senate (recorded in the Congressional Record), bills are passed by Congress and become laws; their contents are re-arranged by subject and published as the U.S. Code: current United States laws. Then, executive-branch agencies produce implementing regulations, which are periodically gathered into the subject-based Code of Federal Regulations; updates to the codes are published daily in the Federal Register.

Discussions of a bill/law: The Library of Congress's Thomas site contains the text of bills, some committee hearings, and the Congressional Register.

The law itself: The House of Representatives maintains a searchable text of the U.S. Code.

The implementation of the law: The Government Printing Office provides access to the CFR / Code of Federal Regulations, and its update, the Federal Register.

Specialized Federal law and regulatory sites include the Environmental Protection Agency and the Occupational Safety and Health Agency.

On the state level ...
Minnesota has made available its Statutes, a subject-based codification of current Minnesota law.

For Wisconsin, their Statutes are also available online.

In Michigan, rules are codified into the Michigan Administrative Code.