Is kratom being adulterated with other drugs?

Both legality proponents and prohibitionists claim that kratom sold in the Western marketplace by some nefarious vendors is adulterated with other drugs such as fentanyl, cocaine, and methamphetamine. But where is the evidence of this? There are confirmed cases in the scientific literature and media that we examine below of kratom being adulterated with O-desmethyltramadol, …

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