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Story summary
- Authorities warn traffickers in Mexico may produce carfentanil or source it from China.
- Carfentanil is a military-use chemical and is 10,000 times more potent than morphine.
- Its resurgence coincides with a decline in U.S. fentanyl seizures and overdoses.
- In 2024 carfentanil deaths nearly tripled to 413.
- Michael Nalewaja's death from fentanyl and carfentanil spurred legislative changes.
