National Meat Assn. v. Harris
The Court ruled that a federal meat-inspection law blocks California from enforcing its own rules on how slaughterhouses must handle pigs that cannot walk, because the federal law already sets out different rules for the same subject.
The decision reinforces that once Congress writes detailed federal rules for slaughterhouse operations, states cannot layer on their own additional or different requirements for the same activities, even if the state's goals are humane rather than just about food safety.
“The FMIA’s preemption clause sweeps widely—and in so doing, blocks the applications of §599f challenged here.”
The Court's core holding that the state law is preempted by the federal meat-inspection law.
How it got here: A federal trial court blocked the state law under the meat-inspection act; the Ninth Circuit reversed; the trade group asked the Supreme Court to review that reversal.
The Case in Depth
What happened
A trade group representing meatpackers sued California over a state law that barred slaughterhouses from buying, processing, or holding pigs unable to walk without immediately euthanizing them. The law followed public outcry after an undercover video showed workers mishandling sick cattle. The trade group argued the federal meat-inspection law, which already regulates how slaughterhouses handle such animals, overrides the stricter state law.
The question before the Court
Could California ban slaughterhouses from buying, processing, or holding pigs that can't walk, when a federal meat-safety law already covers that ground?
Why it matters
Swine slaughterhouses operating in California can continue buying, processing, and holding nonambulatory pigs under federal rules rather than the stricter state ban, at least for now. The ruling also signals to other states that similar humane-treatment rules aimed at slaughterhouse operations may be preempted whenever a federal meat-inspection law already covers the same ground.
What changes now
The case returns to the lower courts, where the trade association's request to block enforcement of the California law against swine slaughterhouses will proceed under the Supreme Court's reading of the federal preemption clause. This is a final merits ruling on the preemption question, though the Court left room for California to regulate slaughterhouses through general laws like building codes or animal-cruelty penalties that don't impose additional or different requirements on the same subject matter.
What this does not decide
The Court did not decide whether California could regulate purchases of nonambulatory pigs that happen away from slaughterhouse premises, since the record didn't establish that the state law applied there. It also left open whether other states' bans on slaughtering entire species, like horses, are similarly preempted.
How the Court got there
The legal reasoning, step by step
- The Court read the federal law's preemption clause broadly: it blocks any state requirement that is additional to or different from federal rules covering slaughterhouse facilities or operations, even if the state rule doesn't directly conflict with federal law.
- Comparing the two schemes, the Court found that federal regulations allow slaughterhouses to hold, buy, and eventually process nonambulatory pigs (subject to inspection), while the state law flatly forbids buying, holding without euthanizing, and processing such pigs — a clear substitution of a new regulatory scheme for the federal one.
- The Court rejected the argument that the state's ban on buying pigs could survive because it might also apply to off-site purchases, since the record didn't show the ban ever applied away from the slaughterhouse, and even if it did, on-site purchases would still be covered by the federal law's focus on slaughterhouse premises and operations.
- The Court also rejected the claim that the state's ban on selling meat from nonambulatory pigs escaped preemption as a mere sales rule, concluding the sales ban functioned as an enforcement mechanism for the rest of the state law's requirements on how slaughterhouses must handle these animals.
- Finally, the Court rejected the argument that the state law fell outside the federal law's scope simply because it excluded a class of animals from slaughter, noting the federal scheme itself excludes certain animals and covers humane treatment as well as food safety, so a humane-treatment rule for the same animals and premises still falls within the federal law's reach.
Doctrinal impact
Cases affected by this decision
Reaffirms Bates v. Dow Agrosciences LLC (544 U. S. 431)
Cited to support that state rules 'equivalent' to federal requirements can survive similar preemption language.