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Wisconsin: Supreme Court Ends Practice of Deferring to State Agency Interpretations of Law

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June 26, 2018

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In Tetra Tech EC, Inc. v. DOR, the Wisconsin Supreme Court ended a longstanding practice of deferring to state administrative agencies’ interpretations of the laws the agencies enforce. Previously, Wisconsin state agencies were given “great weight deference” once certain conditions were met, preventing courts from adopting different interpretations of the law, even if the alternative interpretation was more “reasonable” than the interpretation enforced by the state agency.