Prosecutors accuse Chinese graduate Zhang Zhidong of playing a key role in supplying chemicals used to produce fentanyl in Mexico. According to reports, cartel members and former colleagues describe how Zhang allegedly facilitated connections between Chinese chemical sources and Mexican drug production sites. The allegations centre on the claim that he helped link controlled or precursor chemicals used in illegal drug manufacture to drug labs operating in Mexico, rather than asserting he is directly involved in retail distribution. Multiple accounts referenced in the coverage describe Zhang’s alleged contacts and work relationships that, prosecutors say, supported illicit operations. The reporting also notes that Zhang is described by some sources as having academic training and industry ties, which authorities argue enabled him to navigate supply channels. The sources do not provide confirmed details of any conviction, and the claims are presented as accusations tied to an ongoing legal process.