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Minnesota v. Clover Leaf Creamery Co.

Supreme Court of the United States · 1981 · Constitutional Law

Constitutional LawEqual ProtectionDormant Commerce Clauserational basisequal protectionlegislative factsenvironmental regulationresource conservation

Facts

Minnesota enacted a statute banning the retail sale of milk and certain fluid milk products in nonreturnable, nonrefillable rigid or semirigid containers composed at least 50% of plastic, while permitting other nonreturnable, nonrefillable containers such as paperboard cartons. The legislature stated that nonreturnable, nonrefillable milk containers created solid waste, energy, and natural resource problems and that returnable and reusable packaging should be encouraged. At trial, respondents offered evidence that banning plastic jugs would lead consumers to use paperboard cartons, which they claimed were more environmentally harmful. The state relied on legislative materials suggesting the ban could encourage environmentally preferable alternatives, reduce economic dislocation during a transition, conserve energy, and ease landfill burdens.

Issue

Whether Minnesota's ban on plastic nonreturnable milk containers, while allowing other nonreturnable containers, violated the Equal Protection Clause because the classification was irrational, and whether the statute imposed an unconstitutional burden on interstate commerce under the Commerce Clause.

Rule

Under rational basis review, a statutory classification survives equal protection challenge if the legislature could rationally have concluded that the classification would further a legitimate state purpose; courts do not reweigh conflicting evidence or invalidate a law merely because challengers produce evidence that the legislature may have been mistaken, so long as the legislative facts are at least debatable. Under the dormant Commerce Clause, a nondiscriminatory statute regulating evenhandedly and serving legitimate local interests is invalid only if the incidental burden on interstate commerce is clearly excessive in relation to the putative local benefits.

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One of 10 multiple-choice questions for this case. Pick an answer to see why.

Oregon enacts a statute forbidding grocery stores from selling liquid laundry detergent in nonreturnable rigid bottles made primarily from vinyl, while continuing to allow detergent in paperboard boxes and flexible refill pouches. The legislature cites landfill volume, conservation of natural resources, and energy concerns. At trial, manufacturers present expert studies showing vinyl bottles may actually create less total environmental harm than paperboard packaging.

If the manufacturers bring a federal equal protection challenge, which is the strongest argument for upholding the statute?

Explanation. Under rational basis review, courts do not reweigh conflicting evidence and invalidate a law merely because challengers offer substantial proof that the legislature may have been mistaken. The law stands if the legislature could rationally have concluded the classification would further legitimate purposes and the legislative facts are at least debatable.