Fentanyl overdose deaths claiming thousands of American lives; what is behind the rise?

Nearly one million people have died of drug overdose deaths in the past two decades, but a growing majority of those deaths in recent years have involved dangerous synthetic opioids like fentanyl.  Fentanyl is 50 times stronger than heroin and 100 times stronger than morphine. First synthesized by Belgian chemist Paul Janssen as a painkiller in 1960, it proved to be a useful drug to help patient...

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