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Thanks for the link.

From your link...

....According to the DEA, China and Mexico are the two major sources of fentanyl that enters the United States. Mexican cartels dominate the importation of illegal drugs to the United States, and they have a history of importing methamphetamine precursors from China, synthesizing the drug, and then smuggling it in bulk across the U.S. border. They appear to be doing the same thing with fentanyl today. Yet Mexican-sourced fentanyl is generally of low purity. According to reports from the DEA and Customs and Border Protection (CBP), fentanyl trafficked into the United States from Mexico is, on average, less than ten percent pure. Chinese fentanyl, by contrast, is commonly more than 90 percent pure. We calculate that, adjusting for purity, almost 80 percent of the fentanyl seized by CBP in financial year 2017 was seized at mail and express consignment carrier facilities in shipments of no more than a kilogram. CPB estimates that most of these parcels originated from China.

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There you have it.