Courts frequently look at the following sources in attempting to determine the goals and purposes that the legislative body had in mind when it passed the law:
Courts in the United States and elsewhere have developed a number of principles for handling such evidence of legislative intent. For example, many courts have suggested that the comments of those opposing a bill under consideration should be treated with skepticism on the principle that opponents of a bill may often exaggerate its practical consequences.
One early example of an important US Supreme Court case that relied on legislative intent was Johnson v. Southern Pacific Co. (1904) 196 U.S. 1. The Court decided that a man may sue the railroad for failing to have an automatic coupler since the legislature had attempted to remedy the problem of multiple injuries by railroad coupling.
Others, most notably United States Supreme Court Justice Antonin Scalia, have objected generally to the use of such evidence, rather than reliance on the literal language of the statute.1: 391–393 They argue that such evidence of "legislative intent" is often created by proponents of a bill to persuade a court to interpret the statute in a way that they had failed to persuade the legislative body to adopt when they passed the bill.
Those principles of legislative intent often overlap with those principles of statutory construction that courts have developed to interpret ambiguous or incomplete legislation. For example, the principle that courts should not interpret a statute to produce absurd or unintended results (the golden rule principle) is often informed by evidence of what the proponents of a bill stated on the objectives to be achieved by the statute.
Congressional Research Service (August 31, 2008). "Statutory Interpretation: General Principles and Recent Trends".
Scalia, Antonin; Garner, Bryan A. (2012). Reading Law: The Interpretation of Legal Texts. St. Paul, Minnesota: Thomson/West. ISBN 978-0-314-27555-4. 978-0-314-27555-4 ↩