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https://dx.doi.org/10.1038/d41586-026-02835-4
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Detection of Illegally Manufactured Fentanyls and Carfentanil in Drug

https://dx.doi.org/10.15585/mmwr.mm7348a2
Although rare, deaths with carfentanil detected increased approximately sevenfold, from 29 during January–June 2023 to 238 during January–June 2024; 37 states reported carfentanil detection