Drugs Detected in One-Third of Sexual Assaults Treated at Barcelona Hospital, Five-Year Study Finds

A five-year analysis of nearly 700 cases of drug-facilitated sexual assault (DFSA) treated at Barcelona’s leading referral centre for sexual violence has revealed a shifting and often misunderstood landscape of substance use, assault settings and victim profiles. The retrospective observational study, conducted by researchers at the Hospital Clínic of Barcelona and published in BMC Public Health, examined 682 DFSA cases involving victims aged over 16 who were seen between 2018 and 2022. Its findings challenge several common assumptions about where and how these assaults occur, and they underscore the need for surveillance systems capable of tracking rapidly evolving patterns of substance use.

The Hospital Clínic of Barcelona functions as the reference centre for sexual assault care in its region and has developed a comprehensive care model for recent sexual violence. The centre reports between 400 and 500 sexual assaults annually, and substance use is involved in roughly one-third of those cases. Until now, however, detailed and current data on the victims, the circumstances of the assaults and the specific substances involved have been limited. Alcohol and cocaine had previously been described as the most frequently detected substances, but the research team sought to update and expand that picture using five years of clinical records.

The study’s demographic findings are striking in their consistency. Eighty-five percent of the DFSA cases assessed involved women, and 73 percent involved individuals aged between 18 and 35 years. This concentration in young adulthood, the authors note, has direct implications for how prevention messages and clinical screening protocols should be targeted. Rather than being confined to any single community, the affected population spans a broad swath of the city’s young adult residents and visitors, making general awareness campaigns and routine toxicological screening in emergency and forensic settings essential components of the response.

Perhaps the most consequential finding concerns location. Contrary to the popular image of drug-facilitated assaults as crimes committed in nightclubs and bars, the most frequently reported setting was the private home, accounting for 42 percent of cases, followed by public spaces at 23 percent. Nightlife settings, while significant, did not dominate the data. This distribution matters for prevention strategy: interventions focused solely on drink-spiking in bars may miss the majority of cases, which occur in residential environments where the dynamics of substance consumption and vulnerability may be quite different.

The toxicological profile of the cases reflects both persistent patterns and emerging trends. Alcohol was detected in 55 percent of cases and cocaine in 28 percent, confirming their status as the most prevalent substances. But newer and less commonly monitored drugs featured prominently as well. MDMA appeared in 23 percent of cases and GHB, a central nervous system depressant long associated with sedation-facilitated assault, in 15 percent. The researchers describe these emerging substances as increasing, a trend they argue demands closer monitoring because detection windows, clinical presentation and forensic interpretation differ substantially from those of alcohol and cocaine.

The COVID-19 pandemic introduced a natural experiment into the study period, and the data show that both the contexts of assault and the substances involved shifted during that time. Notably, cases in which drugs were supplied by the perpetrator rose, constituting 17 percent of DFSA cases by 2022. This distinction between voluntary consumption and perpetrator-supplied substances is central to the clinical and legal understanding of DFSA, and its increase over the study period represents one of the study’s most concerning signals.

Sex-specific patterns in substance detection added another layer of complexity. MDMA and cocaine were more prevalent among female victims, while methamphetamine and GHB were more prevalent among male victims. These differences suggest that prevention messaging, clinical suspicion and toxicological screening panels may need to be tailored rather than uniform, since the substances most likely to be involved vary with the victim’s sex and, as the multivariate analysis showed, with the setting in which the assault took place.

The multivariate analysis among female victims produced several statistically robust associations. Cases involving both alcohol and drugs were more frequently associated with public spaces than with nightlife settings, with an odds ratio of 3.75 (95 percent confidence interval 1.55 to 9.05). Cases involving drugs alone were less frequently observed among women aged 18 to 25 than among those aged 25 to 35, with an odds ratio of 0.55 (95 percent confidence interval 0.32 to 0.97), suggesting that drug-only involvement rises with age within this cohort. Meanwhile, assaults occurring in private homes were more frequently classified in the drug-only category compared with nightlife settings, with an odds ratio of 2.46 (95 percent confidence interval 1.14 to 5.45). Taken together, these associations paint a picture in which the combination of substances and the location of the assault are systematically linked rather than randomly distributed.

Methodologically, the study relied on univariate, bivariate and multivariate analyses of clinical records from the reference centre, allowing the researchers to describe victim characteristics and identify independent associations between substance categories, victim demographics and assault settings. The retrospective design means the findings capture patterns among victims who presented for care rather than the full incidence of DFSA in the community, a limitation common to studies of sexual violence. Even so, the size of the cohort and the five-year span give the results unusual weight for this field, where single-centre data are often fragmented or outdated.

The authors conclude that most DFSA cases involved women aged 18 to 35 and that residential settings were the most frequently reported locations, with alcohol and cocaine remaining the most commonly detected substances while newer substances showed distinct patterns according to assault setting and victim sex. Their central recommendation is the establishment of surveillance systems capable of continuously monitoring evolving patterns of substance use and assault contexts, so that prevention programmes and victim care protocols can adapt in near real time. As novel psychoactive substances circulate and consumption habits shift, the study suggests, static assumptions about drug-facilitated sexual assault quickly become obsolete, and only systematic, data-driven monitoring can keep clinical and preventive responses aligned with the reality on the ground.

Subject of Research: Epidemiology and toxicology of drug-facilitated sexual assault cases treated at a Barcelona referral centre from 2018 to 2022

Article Title: Unveiling dynamics of drug-facilitated sexual assault: an observational retrospective study in Barcelona (2018–2022)

Article References: Camps, A., Salgado, E., García-Esteve, L., Echevarría, T., & Bertran, M. J. (2026). Unveiling dynamics of drug-facilitated sexual assault: an observational retrospective study in Barcelona (2018–2022). BMC Public Health. https://doi.org/10.1186/s12889-026-29101-6

Image Credits: AI Generated

DOI: 10.1186/s12889-026-29101-6

Keywords: drug-facilitated sexual assault, DFSA, sexual violence, toxicology, alcohol, cocaine, GHB, MDMA, Barcelona, Hospital Clínic, public health, victim care