SIOUX FALLS, S.D. (KELO) -- Sometimes hidden in pills or powders, and often impossible to detect before it's too late. Carfentanil is a drug so powerful that just a few grains can shut down the human body in seconds. It's colorless, it's odorless, and at 10,000 times stronger than morphine, Carfentanil is one of the [...]

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