In Cincinnati, some medical and law enforcement officials said they believed the overdoses were largely caused by a synthetic drug called carfentanil, an animal tranquilizer used on livestock and elephants with no practical uses for humans. Fentanyl can be 50 times stronger than heroin, and carfentanil is as much as 100 times more potent than fentanyl. Experts said an amount smaller than a snowflake could kill a person.
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