The findings of the largest European project to date in the emerging science of wastewater analysis are taken up in this ‘Perspective on drugs’. The project in question analysed wastewater in around 60 European cities and towns (hereinafter referred to as ‘cities’) to explore the drug-taking habits of those who live in them. The results provide a valuable snapshot of the drug flow through the cities involved, revealing marked geographical variations.

Table of contents
• Analysis: results from a European multi-city study
• Interactive: explore the data from the study
• Terms and definitions
• Understanding the wastewater method, and addressing ethical issues