Committee reports, hearing testimony, and congressional debates provide the context for passed and failed legislation. Several databases allow tracking of current legislation and provide legislative histories of passed and failed bills.
Statutes, codes, and regulations are found in WestlawNext, HeinOnline, and at government sites. The United States Code Annotated and the individual state codes in WestlawNext have various 'Tools & Resources' on the right side of the screen. These links are helpful for finding laws by topic and popular name. HeinOnline is very useful for older editions of statutes, codes, and regulations.