On June 5, 2025, the Supreme Court reversed a controversial First Circuit decision about aiding-and-abetting liability. The decision was a victory for WLF, which filed an amicus brief in the case. Splitting from other courts of appeals and state courts of last resort, the First Circuit held that Mexico could sue firearms manufacturers for allegedly causing the drug-cartel violence in Mexico. WLF’s brief explained that just last term in Twitter v. Taamneh, the Supreme Court held that companies cannot be held liable under an aiding-and-abetting theory when criminals use lawful products in an unlawful manner. Here, Mexico alleged that the firearms manufacturers could be held liable for making and selling lawful products that criminals misused. As the Supreme Court confirmed here, that is not the law.
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