Nearly 80% of Young Offenders in a Spanish Psychiatric Unit Used Drugs | Research

The takeaway

Among 144 adolescent offenders assessed in a Spanish psychiatric unit, 78.5% used drugs, with cannabis being predominant. Teens with psychotic disorders tended toward cannabis, while those with ADHD tended toward cannabis and cocaine.

Read this if you work in juvenile justice or are interested in the overlap between youth substance use and mental health.

78.5% of adolescent offenders used drugs; 65.3% had psychiatric diagnoses

What the researchers found

Researchers studied 144 youth seen in a Therapeutic Juvenile Justice Unit in Spain. Drug use was extremely prevalent at 78.5%, with about half using only one substance.

Mental health diagnoses were common: 65.3% had an Axis I disorder (22.2% psychotic spectrum, 18.1% ADHD), and 42.4% had a personality disorder (16% antisocial, 6.9% borderline).

Substance preferences varied by diagnosis: psychotic teenagers tended to use cannabis, while ADHD patients gravitated toward both cannabis and cocaine. Significant associations were found between nationality and inhalant use, socioeconomic level and sedative/alcohol use, and parental death and alcohol use.

Why it matters

The extremely high rate of co-occurring substance use and mental illness in juvenile offenders suggests that the criminal justice system is often dealing with untreated psychiatric and addiction problems rather than purely criminal behavior.

The numbers in context

144 youths; 78.5% drug users; 51.4% used only one substance; 65.3% Axis I disorder; 42.4% personality disorder; 22.2% psychotic spectrum; 18.1% ADHD; 16% antisocial personality

How the study worked

Descriptive cross-sectional study of 144 youths assessed at a Therapeutic Juvenile Justice Unit in Barcelona, Spain. Assessed psychiatric diagnoses, substance use, and demographic/criminal characteristics.

What this study cannot tell us

Single clinical unit in Spain. Descriptive study without control group. Small sample for subgroup analyses. Cultural and legal context may not translate to other countries. Selection bias toward more severe cases referred to a therapeutic unit.

How to read the evidence

Descriptive cross-sectional study from a single unit. Provides important prevalence data but cannot establish causal relationships.

When this study was published

Published in 2015. Youth mental health and substance use in justice settings remain pressing issues.

The bigger picture

Juvenile justice systems worldwide face populations with high rates of mental illness and substance use. Effective intervention requires integrated treatment addressing both issues, not just criminal behavior.

Questions still open

Would integrated mental health and substance use treatment reduce reoffending? Why do psychotic youth prefer cannabis while ADHD youth prefer stimulants? Could early mental health screening prevent criminal justice involvement?

Common questions

Why is drug use so high among young offenders?

The 78.5% rate reflects the deep overlap between substance use, mental illness, and criminal behavior in youth. Many had psychiatric conditions (65.3%) that may have contributed to both drug use and offending. These are often intertwined problems rather than separate issues.

Does the type of mental illness predict which drug teens use?

The study found tendencies: psychotic youth preferred cannabis, while those with ADHD used both cannabis and cocaine. These are correlational patterns in a small sample, but they align with the idea that substance choice may relate to underlying neurobiology.

Read the original research

Troubled adolescents: substance abuse and mental disorder in young offenders.

Actas espanolas de psiquiatria, 43(6), 197-204

View on PubMed ↗

Citation

Ribas-Siñol, Maria; Del Prado-Sanchez, Noemi; Claramunt-Mendoza, Jaume; Civit-Ramirez, Monica; Canalias-Perez, Oriol; Ochoa, Susana. (2015). Troubled adolescents: substance abuse and mental disorder in young offenders.. Actas espanolas de psiquiatria, 43(6), 197-204.