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AI-DRAFTED — PHYSICIAN REVIEW IN PROGRESSThe citation for this entry was checked against Crossref and PubMed, but its summary and interpretation were drafted by an AI model from the published abstract and have not yet been individually read by a physician. Read the linked source before relying on this operationally.
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Recreational Drug Use at a Music Festival: A Dual Approach Using Hair Biomarkers Analysis and Participant Self-Reported Drug Use[1]

Simao AY, Rosado T, Barroso M, Andraus M, Gallardo E · 2026 · Drug Test Anal

Summary

Study at an international music festival in Portugal (2022-2023) validating self-reported drug use against objective hair biomarkers in 249 attendees, using LC-MS/MS on hair alongside a survey. Alcohol (96%) and cannabinoids (90%) were the most common lifetime self-reported substances; 50% of participants tested hair-positive for at least one compound, with cocaine (24.5%), MDMA (24.1%) and ketamine (22.9%) the most detected. Critically, some participants who DENIED use tested positive - self-reported non-use was inversely associated with hair positivity for MDMA (OR 0.25, 95% CI 0.09-0.65) and ketamine (OR 0.19, 95% CI 0.09-0.40) - evidencing systematic under-reporting. Internal-consistency checks (cocaine/benzoylecgonine; CBD/THC) supported the toxicology.

So what

A quantified caution for anyone planning a festival medical service off self-report or survey data: attendees systematically under-report the exact drugs that drive the dangerous presentations (MDMA, ketamine), so the true stimulant/dissociative exposure is materially higher than the crowd will admit. Roughly one in four festival-goers carried a cocaine, MDMA or ketamine biomarker and half were positive for something - a polydrug baseline the medical plan should size to, not the (lower) self-reported figure. Strengthens the toxicology-alcohol shelf and the genre-prediction page's EDM case-mix, and gives the disposition/staffing argument a denominator: plan for the biomarker prevalence, not the questionnaire. Single-festival, hair = longer-window not same-day, so cite for the under-reporting effect and prevalence order, not acute-load timing.

Key findings

  • International music festival, Portugal 2022-2023; 249 attendees, hair LC-MS/MS + self-report
  • 50% hair-positive for >=1 compound; cocaine 24.5%, MDMA 24.1%, ketamine 22.9%
  • Self-reported non-users tested positive: MDMA OR 0.25, ketamine OR 0.19 (systematic under-reporting)
  • Alcohol 96% / cannabinoids 90% by lifetime self-report; polydrug patterns confirmed
  • Plan festival tox load to the BIOMARKER prevalence, not the (lower) self-report; free PMC

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