Easy. You get a product like fentanyl which is made in a laboratory from precursors that are not illegal in that country. You either make the product in country or ship precursors to Mexico and make it there. You take your heroin or oxycodone, cut it and ship it.
There are a lot of controls on precursors to ice or mdma but very little on emerging recreational drugs like fentanyl.
In a hospital setting its been used for many years as a breakthrough pain medication. Generally speaking morphine is adequate enough but some forms of cancer are very painful. Due to inherent risks handling fentanyl it’s usually put in patch form.
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