First responders have found that standard doses of naloxone aren't always enough to counteract the powerful sedating effects of carfentanil. Ted Horowitz/Getty Images hide caption

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An Even Deadlier Opioid, Carfentanil, Is Hitting The Streets

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These pills were made to look like Oxycodone, but they're actually an illicit form of the potent painkiller fentanyl. A surge in police seizures of illicit fentanyl parallels a rise in overdose deaths. Tommy Farmer/Tennessee Bureau of Investigation/AP hide caption

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Heroin sold in the U.S., like this dose confiscated in Alabama last fall, is often cut with other drugs. Tamika Moore/AL.com/Landov hide caption

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Illicit Version Of Painkiller Fentanyl Makes Heroin Deadlier

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