Human overdoses on the rise from rhinoceros anesthetic that's 100 times more potent than fentanyl

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Carfentanil is a synthetic opioid used in veterinary medicine to knock out huge animals like elephants and rhinoceroses for surgery. It's apparently 10,000 times more stronger than morphine and 100 times more potent than fentanyl, of which it's an analog compound. While it's still uncommon on the street, the number of over…