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The Necessary and Proper clause(also known as the Elastic clause) from Section 8 of Article One of the United States Constitution clause provides a legislative blank check of sorts for Congress, allowing the creation of any law seen as "necessary" or "proper" regardless of its mention in the United States Constitution.
An example of the Necessary and Proper clause in effect is the Civil Rights Act of 1964 which, although its intentions were never mentioned in the Constitution, Congress felt it necessary and proper to pass it into law.