Fentanyl and carfentanyl belong to the group of drugs known as opioids. They are currently both in the news in relation to the "opioid crisis" that is gripping North America, both Canada and the United States. Fentanyl was created for human use, while carfentanyl was only ever intended for large animal use like elephants. However, these substances are both being found in illicit drugs being marketed as heroin, MDMA, or cocaine. During Prohibition times in the USA, bootleggers used more and more...
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