Question - Which country is the primary source of supply for fentanyl and fentanyl precursors destined for the US, Canada and Mexico?
Answer- China is the primary source of supply for fentanyl and fentanyl precursors destined for the US, Canada and Mexico. (https://www.dea.gov/docs/Counterfeit%20Prescription%20Pills.pdf; accessed March 2018)
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