Municipal water testing as an innovative approach to track + measure drug use. 

Key Findings:

• When used in combination with geospatial mapping and advanced analytics, wastewater-based epidemiology has the potential to help officials predict rather than react to changes in drug use.

https://www.mathematica-mpr.com/our-publications-and-findings/publications/identifying-the-next-drug-epidemic-by-testing-municipal-wastewater-in-focus-brief