Packaging and routing of fentanyl from Sinaloa to the US exposed

Using new methods, the Sinaloa Cartel continues to traffic fentanyl to the US despite increased operations by US authorities. Credit: AP

The person packaging fentanyl at a Culiacán, Sinaloa, auto repair shop moves with precision. He sprays six foil-wrapped packages with a compound he says will help sniffer dogs miss the drug.