BaBa
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‘Too strong for me’: On Mexico-US border, fentanyl poses growing hidden danger Elena prepares a syringe of heroin, a drug she has been using for 20 years. Now, however, it is almost certain that it is mixed with fentanyl, a potentially lethal substance. A rapid test at a Mexican safe-use centre in the town of Mexicali, near the US border, confirms the presence of the synthetic opioid, which is 50 times more potent than heroin.