Fentanyl, a powerful synthetic opioid that can be 100 times more potent than morphine, is the most common drug involved in overdose deaths in the US – fueling an opioid crisis that has become a high-priority issue for the Trump administration.
For many years, China has been the largest source of both legal supplies of the drug – which is prescribed for severe pain relief – and illicit supplies of precursor chemicals that are typically processed in labs in Mexico before the final product is smuggled across the US border.