Peer-led drug checking in Chile: a case study of the country's first harm reduction service at electronic music events.
Harm reduction journal February 14, 2026 Camilo Obregón-berg, Bruno Fuentealba-Donoso, Isidora Vidal et al.
At 22 electronic music events in Santiago, Chile, a peer-led drug-checking program analyzed 992 samples from attendees. Over 80% of samples expected to be MDMA contained MDMA, while 10% contained MDA instead and 8% were adulterated with methamphetamine. All cocaine samples contained cocaine, but 71% were adulterated. Ketamine was the only substance in 42% of ketamine samples; 33% contained ketamine and MDMA, 15% had ketamine plus other substances, and 10% had no detectable substances. Tusi samples varied widely. Excluding tusi, about 70% of samples matched expectations, 14% were adulterated, and 16% lacked the expected drug. The findings highlight the need for expanded harm reduction services in Chile.