There is a man in a NSW remand cell tonight whose ADHD has never been named, whose autism has never been assessed, and whose first contact with a clinician will probably be a forensic psychiatrist explaining to a magistrate why he failed to follow a bail condition he never quite understood. Australia knows roughly how to count him. Australia has not yet decided whether to help him.
In twelve days, on the evening of Tuesday 13 May, Treasurer Jim Chalmers will hand down the 2026–27 federal budget. The single largest savings line is expected to come from the National Disability Insurance Scheme, where Health Minister Mark Butler has already signalled — in his 22 April National Press Club address — a shift to functional-capacity assessment and a planned reduction from roughly 760,000 participants to 600,000 by the end of the decade. The headline argument has been about who belongs in the NDIS. The much quieter question, the one most cabinet briefings won’t raise, is what happens to the AuDHD Australians who never made it through any door at all — and ended up walking through the heaviest one in the country.
The numbers we already have
The most rigorous Australian study of ADHD in adult prisoners was conducted at four NSW correctional facilities by clinicians and researchers from the Justice Health and Forensic Mental Health Network and UNSW. Their findings, published in the Journal of Attention Disorders, were stark: 35 per cent of the sample screened positive for adult ADHD, and 17 per cent met criteria for a full diagnosis. The general adult prevalence of ADHD is roughly 2.5 to 4 per cent. Even taking the conservative 17 per cent figure, ADHD is between four and seven times more common inside the wall than outside it. Adult ADHD in that cohort was independently associated with benzodiazepine dependence, antisocial personality disorder, social phobia, and a suite of other lifetime psychological diagnoses — exactly the pattern you would expect when an executive-function condition has been left unnamed for decades and self-medicated with whatever the corner shop sells.
Autism is harder to count, partly because prison entry screens were never designed to detect it. A 2025 systematic review led by Verity Chester and colleagues, published in Journal of Forensic Psychiatry & Psychology, synthesised the international evidence and found autism prevalence inside criminal-justice cohorts ranging from 1 to 60 per cent depending on setting and screening method — but consistently higher than the 1 to 3 per cent expected in the general population. Three of the included studies were Australian. None used a standardised screen. The review’s most uncomfortable conclusion was procedural: most autism diagnoses inside prisons happen after sentencing, often after a forensic assessment ordered because something has gone visibly wrong on a unit.
Layered on top, the 2024 meta-analysis by Yee, Browne, Rahman and Dean — covering five decades of Australian and New Zealand prison data in the Australian and New Zealand Journal of Psychiatry — confirmed that mental illness rates in our prisons remain dramatically elevated compared to the community. ADHD and autism are the two diagnoses most likely to be missed in those screens, because both can present as ‘behavioural’ rather than psychiatric, and because both tend to be quietly stripped of any clinical relevance the moment a person is charged.
Why AuDHD is not a footnote
If autism and ADHD each independently raise the odds of contact with the criminal-justice system, their co-occurrence — AuDHD — is where the harms compound. Roughly half to seventy per cent of autistic Australians also meet criteria for ADHD, depending on cohort, and the two conditions interact in ways forensic systems are particularly badly designed to read.
Autistic vulnerability factors documented in the literature are by now familiar: difficulty reading social cues during a police interview, deferential or compliant responding under pressure, monotonic presentation that gets misread as flatness or guilt, and literal interpretation of questions that were never meant literally. Sentencing data has shown autistic offenders attracting longer sentences across multiple offence categories, partly because behaviour that looks ‘remorseless’ in court is often a regulation strategy that has nothing to do with remorse. ADHD then layers in the impulsivity profile that drove the offence in the first place, the executive dysfunction that makes bail conditions hard to track, and the rejection-sensitive escalation that turns a minor misunderstanding into a custodial event. The AuDHD person carries both burdens at once. The prison system sees neither.
What the evidence says actually works
The good news, and the line cabinet should be reading carefully, is that this is one of the most treatment-responsive cohorts in the entire correctional population. The landmark 2012 New England Journal of Medicine study by Paul Lichtenstein and colleagues followed more than 25,000 Swedish adults with ADHD across periods on and off pharmacotherapy. Compared with their own off-medication periods, the same individuals had a 32 per cent lower rate of criminal conviction while medicated, and women had a 41 per cent reduction. Newer scoping reviews, including the 2024 Health & Justice synthesis, show similar protective effects of treatment in correctional settings, with reductions in critical incidents, self-harm, and recidivism on release. Treating ADHD inside is not a soft option. It is one of the few interventions in this space with a hazard ratio that survives scrutiny.
Australia knows this. The 2023 Senate Inquiry into ADHD assessment and support services, which received 701 submissions and reported on 7 November 2023, named criminal-justice over-representation explicitly. ADHD Australia‘s own Hidden Crisis in Criminal Justice position paper has called for routine prison-entry screening, treatment access aligned with the Australian Evidence-Based Clinical Practice Guideline for ADHD (AADPA, NHMRC-approved), and post-release continuity. The recommendations exist. The funding has not.
Twelve days, three asks
A pre-budget article is not an academic paper, and AuDHD readers are entitled to a list they can send to a federal MP before Tuesday week. Three things would change the trajectory.
First, standardised neurodevelopmental screening at every prison entry, applied at reception by a nurse rather than retrospectively by a forensic psychiatrist after something has already broken. The NSW Justice Health network has already piloted suicide and mental-health screening at entry; an ADHD and autism screen, validated against the AADPA guideline and the 2018 Autism CRC National Guideline for the Assessment and Diagnosis of ASD, is a small extension with a large downstream return.
Second, treatment continuity for AuDHD on remand and post-release. Stimulant medication continuity for already-diagnosed adults entering custody is currently patchy and varies by jurisdiction. Continuity of script, not interruption, is the evidence-aligned default. So is the harder, more important task of ensuring that someone diagnosed inside leaves with a real prescriber on the outside — not a referral letter and a fortnight’s supply.
Third, AuDHD-aware diversion before sentencing. The 2026 NSW Local Court psychosis-diversion data-linkage study by Spike, Butler and colleagues, published this year in the Australian and New Zealand Journal of Psychiatry, has begun to map who currently gets diverted out of court and into health pathways. Neurodevelopmental over-representation is a logical next extension. Diversion is cheaper than incarceration. It is also, demonstrably, less harmful.
The closing thought
The pre-budget national conversation has been framed as a debate about NDIS sustainability and who should be inside the scheme. AuDHD Australians inside our prisons are a reminder that the country has been paying for this care all along — just badly, and at the wrong end. Untreated ADHD and unrecognised autism do not disappear when a person is charged. They become a cost line on a different ledger: court hearings, custodial beds, forensic psychiatry, recidivism, suicide, and family grief. Australia is already spending the money. The Treasurer’s choice on 13 May is not whether to spend on AuDHD; it is whether to spend on diagnosis or on detention.
A man in a remand cell tonight is, statistically, very likely to be one of us. Twelve days from now, the country will decide whether his next contact with a clinician is a screen or a sentence.
Sources
Moore et al., Adult ADHD Among NSW Prisoners: Prevalence and Psychiatric Comorbidity, Journal of Attention Disorders
Chester et al., Autistic People within Forensic Psychiatric Services and the Criminal Justice System: A Systematic Review, Journal of Forensic Psychiatry & Psychology, 2025
Yee, Browne, Rahman & Dean, Prevalence of mental illness among Australian and New Zealand people in prison, ANZJP 2024
Lichtenstein et al., Medication for Attention Deficit-Hyperactivity Disorder and Criminality, NEJM 2012
Senate Inquiry into Assessment and Support Services for People with ADHD, Final Report, 7 November 2023
ADHD Australia — The Hidden Crisis in Criminal Justice
Australian Evidence-Based Clinical Practice Guideline for ADHD (AADPA)
Spike et al., Health characteristics and court diversion among adults with psychosis in the NSW Local Court, ANZJP 2026
Marr, Browne et al., Mental health and self-harm/suicide risk screening at prison entry in NSW, ANZJP 2025
Mark Butler MP — National Press Club Address, 22 April 2026
Federal Budget 2026–27 — Treasurer Jim Chalmers, 13 May 2026
AUDHD Australia — What is AuDHD?
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