What You Need to Know in a Minute or Less

In Loper Bright Enterprises v. Raimondo , the US Supreme Court overturned the 40-year-old doctrine established in Chevron U.S.A., Inc. v. Natural Resources Defense Council, Inc. , which had directed federal courts to defer to an agency’s reasonable interpretation of an ambiguous statute that the agency administers. Chevron deference was a cornerstone of modern administrative law—a pragmatic presumption that ambiguities found in statutes reflected Congress’ implicit desire to delegate legislative power to agencies to fill in the details. This power sometimes meant that a statute could legitimately be read to have multiple meanings, depending on which administration was reading it.

Reviewing courts would often uphold agencies’ shifting inte

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