However, Mexico’s efforts to fight drugs like the deadly synthetic opioid fentanyl — which is manufactured by Mexican cartels using chemicals imported from China — have weakened in the last year.

Fun fact

The majority of those imported precursor chemicals are imported into the US and then driven across the border, smuggled into Mexico.

https://www.reuters.com/investigates/special-report/drugs-fentanyl-shipping/

The “no u” gambit