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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Tommy Farmer/Tennessee Bureau of Investigation/AP

Surplus and expired drugs collected during the DEA's fourth National Prescription Drug Take-Back Day. New research suggests it might be better for the environment to dispose of drugs in household trash. Keith Srakocic/AP hide caption

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Keith Srakocic/AP