Nondelegation Doctrine

 The principle in administrative law that congress cannot delegate its legislative powers to agencies.  Rather, when it instructs agencies to regulate, it must give them an "intelligible principle” on which to base their regulations. Whitman v. American Trucking Associations, Inc., 531 U.S. 457 (2001). This standard is viewed as quite lenient, and has rarely, if ever, been used to strike down legislation.  
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