Drug abuse has become a prominent issue in Mexico City, the injection needle represents the material involved in the drug’s human consumption, specifically, cocaine consumption. The country has witnessed a rise in cocaine abuse since the 90s, and the trend is going up as a by-product of regional drug trafficking. Drug adoption has left a trace in the soil, cocaine (COC) and its metabolites, benzoylecgonine (BE) has been detected in the wastewater and will be stored in the agriculture soil through irrigation process.
Brouwer, Kimberly C, Patricia Case, Rebeca Ramos, Carlos Magis-Rodríguez, Jesus Bucardo, Thomas L Patterson, and Steffanie A Strathdee. "Trends in Production, Trafficking, and Consumption of Methamphetamine and Cocaine in Mexico." Substance Use & Misuse 41, no. 5 (2006): 707-27.