Carlos is a Mexican businessman. Two associates accompanied him as he travelled [to] India. There, [he] met Manu Gupta, a businessman active in a variety of sectors. On 25 September 2018 he was arrested in the city of Indore, Madhya Pradesh, along with a Mexican associate and an Indian chemist. The three men were wearing masks and gloves " and were in possession of more than 10kg of fentanyl " an ultra-potent synthetic opioid. The case sheds light on the international networks which Mexican cartels have built up " and the business methods they employ to dominate the lucrative fentanyl market. Fentanyl increasingly displaced heroin on the underground market, causing record numbers of overdoses around the world. In 2018, fentanyl and similar synthetic drugs accounted for nearly half of the 67,367 drug overdose deaths in the US. This year, overdoses have rocketed during the coronavirus pandemic, with more than 40 US states reporting an increase in drug mortality rates " particularly from synthetic opioids like fentanyl. In theory, sales of precursors are highly regulated. In reality, the extent of the problem is revealed with a simple Google search. Entering keywords for fentanyl precursors quickly leads you to the social network Pinterest, where " nestled between wedding moodboards and home decor inspiration " are posts from Chinese companies offering fentanyl precursors for export " many directed towards Mexico.