Chevron U.S.A. V. Natural Resources Defense Council


When a court reviews an agency's construction of a statute which it administers, there are 2 issues: (1) if Congress spoken to the issue, the court must give effect to the unambiguously expressed intent of Congress; (2) if the statute is silent or ambiguous on an issue, the court must determine whether the agency's position is based on a permissible construction of the statute.