{"ID":63786,"name":"Hain Celestial Group, Inc. v. Palmquist","href":"https:\/\/api.oyez.org\/cases\/2025\/24-724","view_count":0,"docket_number":"24-724","additional_docket_numbers":null,"manner_of_jurisdiction":"Writ of \u003Ci\u003Ecertiorari\u003C\/i\u003E","first_party":"The Hain Celestial Group, Inc., et al.","second_party":"Sarah Palmquist, Individually and as Next Friend of E.P., a Minor","timeline":[{"event":"Granted","dates":[1745816400],"href":"https:\/\/api.oyez.org\/case_timeline\/case_timeline\/55644"},{"event":"Argued","dates":[1762236000],"href":"https:\/\/api.oyez.org\/case_timeline\/case_timeline\/55724"},{"event":"Decided","dates":[1771912800],"href":"https:\/\/api.oyez.org\/case_timeline\/case_timeline\/55785"}],"lower_court":{"ID":10,"name":"United States Court of Appeals for the Fifth Circuit","href":"https:\/\/api.oyez.org\/taxonomy\/term\/10"},"facts_of_the_case":"\u003Cp\u003EGrant and Sarah Palmquist\u2019s son Ethan developed normally until about 30 months of age, when he experienced sudden and severe developmental regression, including cognitive, behavioral, and physical impairments. He was later diagnosed with a range of conditions\u2014some physical, like seizures and hypotonia, and others mental, like autism and neurocognitive disorders. Tests also revealed high levels of toxic heavy metals in Ethan\u2019s system, which some physicians attributed to heavy-metal poisoning. The Palmquists linked his symptoms to his nearly exclusive consumption of Earth\u2019s Best Organic baby food\u2014manufactured by Hain Celestial Group, Inc. and sold by Whole Foods Market, Inc.\u2014from infancy through toddlerhood. In 2021, a U.S. House Oversight Committee report revealed that Hain\u2019s baby foods contained high levels of arsenic, lead, cadmium, and mercury and that Hain had not tested final products for such contaminants until 2019.\u003C\/p\u003E\n\u003Cp\u003EIn 2021, the Palmquists sued Hain and Whole Foods in Texas state court, raising various state-law claims. Hain removed the case to federal court, alleging that Whole Foods had been improperly joined to defeat diversity jurisdiction. The district court agreed, dismissed Whole Foods, and denied the Palmquists\u2019 motion to remand. It later granted judgment as a matter of law for Hain during trial. On appeal, the U.S. Court of Appeals for the Fifth Circuit reversed, holding that the Palmquists had adequately stated claims against Whole Foods, defeating diversity jurisdiction. It vacated the judgment and remanded the case with instructions to return it to state court.\u003C\/p\u003E\n","question":"\u003Cp\u003EMust a federal court\u2019s final judgment be set aside if the case did not have complete diversity when it was removed from state court, and can a plaintiff block diversity jurisdiction by updating the complaint after removal to include a valid claim against a nondiverse defendant?\u003C\/p\u003E\n","conclusion":"\u003Cp\u003EA federal court cannot create jurisdiction over a lawsuit through its own erroneous ruling, and when an appellate court reverses a district court\u0027s mistaken dismissal of a party who destroyed complete diversity\u2014meaning all plaintiffs and defendants must be from different states for federal court to hear the case\u2014the jurisdictional defect never disappears and any trial verdict must be thrown out. Justice Sonia Sotomayor authored the unanimous majority opinion.\u003C\/p\u003E\n\u003Cp\u003EFederal courts can hear a lawsuit between citizens of different states only if every plaintiff is from a different state than every defendant\u2014a requirement called \u0022complete diversity.\u0022 When a defendant moves a case from state court to federal court (\u0022removal\u0022), that diversity must exist at the moment of removal. If it does not, an appellate court reviewing the case can excuse that original defect only if the district court genuinely fixed it before trial ended\u2014for example, by properly dismissing the nondiverse party with everyone\u0027s agreement, as happened in Caterpillar Inc. v. Lewis (1996). A defect that is never truly fixed is said to \u0022linger through judgment,\u0022 which requires the appellate court to void the verdict entirely. Here, the district court\u0027s dismissal of Whole Foods\u2014a Texas company sued alongside the Texas-citizen plaintiffs\u2014was an interlocutory order, meaning it did not fully resolve the case and remained open to reversal on appeal. When the Fifth Circuit reversed that dismissal as incorrect, Whole Foods was legally restored to the case, and the parties were no longer completely diverse. The jurisdictional defect had therefore never been cured.\u003C\/p\u003E\n\u003Cp\u003EHain argued that efficiency justified preserving the verdict because the parties happened to be fully diverse at the moment the final judgment was entered. That argument fails because no principle of law allows a court to manufacture jurisdiction through its own mistake\u2014permitting that would let courts expand their own power beyond the limits Congress set. Hain also asked the appellate court to use Federal Rule of Civil Procedure 21 to drop Whole Foods from the case and salvage the verdict. That remedy was unavailable here because plaintiffs, not defendants, hold the right to choose their forum and to decide whom to sue. The Palmquists deliberately sued Whole Foods\u2014a Texas company\u2014precisely to keep the case in state court, and they promptly moved to send it back there. Allowing a competing defendant to forcibly drop Whole Foods over the plaintiffs\u0027 objection would strip the plaintiffs of their recognized right to control the structure of their own lawsuit.\u003C\/p\u003E\n\u003Cp\u003EJustice Clarence\u00a0 Thomas concurred in full but wrote separately to flag his skepticism of the \u0022improper joinder\u0022 doctrine itself, arguing that federal courts likely cannot expand their own jurisdiction by assessing the merits of claims against nondiverse parties before deciding whether they have power to hear the case at all, and inviting a future case to squarely address that doctrine\u0027s validity.\u003C\/p\u003E\n","advocates":[{"advocate":{"ID":41442,"name":"Sarah E. 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