The study, which analyzed wastewater from 115 cities in 25 countries, provides critical insights into the changing landscape of illicit drug consumption in Europe.
From 2024 to 2025, MDMA residues in wastewater decreased by 16%, indicating a potential shift in user preferences or availability.
Conversely, ketamine usage saw a substantial increase of 41% during the same period, raising questions about its rising prevalence in the region.