The traditional methods of analyzing fentanyl precursor shipments in aggregate are falling short.
While overall shipment volume has remained broadly stable since 2020, the structure beneath that volume has changed dramatically—routes, intermediary countries, sender companies, receiver relationships, and chemical categories have all reorganized.
What are the most important ways cartels are reorganizing their drug supply chains? How do fentanyl supply chain changes impact the trade of drug precursors beyond synthetic opioids? How should law enforcement and customs analysts change their methods to better detect illicit drug precursors?
This NSDPI paper explores questions like these in a detailed analysis of Mexico-bound shipments of narcotics-flagged chemicals from January 2020 through April 2026. Our findings offer new layers and nuances to drug precursor monitoring as well as policy recommendations to prioritize bilateral cooperation, improve due diligence, and detect suspicious patterns more efficiently.
Key takeaways include:
- Some transshipment hubs are actually company registration artifacts rather than real physical choke points. This makes it key to verify the Mexican port of entry to distinguish physically plausible hubs from unlikely routing patterns.
- The observable trade record contains larger volumes of chemicals associated with cocaine and methamphetamine than fentanyl precursors alone, suggesting analysts should adapt their monitoring to include the broader drug supply chain.
- Reproducible screening tools can improve analyst coverage, such as simple checks based on single-source reporting, proximity to known bad actors, anomalous sender-receiver pairings, and chemical-specific concentration.