Drug Poisoning Accounts for More Than a Third of Deaths Among Welsh Prison Leavers
More than a third of deaths among former prisoners supervised by probation services in Wales were drug related in 2024-25, a figure that places substance use at the center of a widening public health and criminal justice crisis. The Wales Governance Centre at Cardiff University says 37% of all deaths in that group were linked to drugs, compared with just over a fifth across England and Wales as a whole. In raw numbers, 52 prison leavers died in Wales during the year examined, and 19 of those deaths were classified as drug poisonings with intent recorded as undetermined.
The concentration of deaths in this category is difficult to ignore. It points to a period of extreme vulnerability immediately after release, when tolerance has often fallen, housing may be unstable, and continuity of treatment can break down at the same moment probation supervision begins. For people with opioid or polysubstance dependence, that combination can turn a return to the community into a fatal transition rather than a supervised reintegration.
Release, Loss of Tolerance, and the First Days Outside Custody
The clinical logic behind these deaths is familiar even if the policy response is not. A person leaving prison after weeks or months of enforced abstinence may return to drug use with a reduced physiological tolerance, increasing the risk of overdose from doses that previously would have been survivable. If homelessness, untreated mental illness, or interrupted addiction care are layered on top, the probability of harm rises sharply. In this setting, drug poisoning is not an isolated event; it is often the endpoint of a sequence of failures spanning custody, probation, health care, and housing.
David Bennett of Wallich, Wales’s largest homelessness charity, argued that most drug-related deaths are preventable if drug use is treated as a health issue rather than solely a criminal justice problem. His point aligns with the pattern in the data: unstable accommodation and weak care continuity do not just accompany substance misuse, they amplify it. A person released without safe shelter, rapid access to treatment, and coordinated follow-up is far more exposed to overdose, relapse, exploitation, and avoidable death.
Dr Robert Jones, who authored the report, said the figures point to systematic failures with tragic consequences and described a lack of meaningful debate about the causes of these deaths. The report draws on UK government data and Freedom of Information requests, and it uses those data to argue that criminal justice issues in Wales can fall between the gaps when responsibility is split between Westminster and devolved Welsh services.
Homelessness Is Moving in the Wrong Direction
The report also links prison release to homelessness, another factor with direct clinical relevance. The number of people leaving prison and supervised by Welsh probation services who were recorded as rough sleeping on the day of release rose by 24% in 2025-26, reaching 695 people. Rough sleeping at the moment of release is not simply a social statistic. It often means no secure place to store medication, no stable contact point for follow-up, and no realistic chance of maintaining routine care for addiction, mental illness, or chronic disease.
For people with substance dependence, the absence of housing can accelerate relapse. It also makes overdose response harder because individuals are less visible to services and more likely to use in isolation or in unsafe environments. The report does not present this as a theoretical concern; the figures place it directly alongside the mortality data, showing how housing insecurity and drug-related death travel together through the post-release period.
Devolution, Responsibility, and the Gaps in Care
Wales’s criminal justice system remains controlled by Westminster, even as social policy areas such as substance use, housing, education, and local government sit within Welsh devolved responsibilities. Jones said that arrangement creates a structural problem: criminal justice and health policy may be debated in separate places, while the people most at risk live at the intersection of both. The report raises questions about whether the Welsh government has enough authority and practical levers to address the underlying causes of these outcomes.
The Welsh government has long argued for full devolution of justice, and its spokesperson said the findings strengthen that case. The argument is straightforward. If the same administration is accountable for health boards, local authorities, and substance misuse services, but not for prisons, probation, or sentencing policy, then joined-up intervention becomes harder to deliver. Care pathways can stall at the prison gate. Funding streams can remain fragmented. Clinical responsibility becomes diffuse, while mortality remains concentrated.
A Ministry of Justice spokesperson said the UK government inherited prisons in crisis and is acting on multiple fronts, including reducing the number of women in custody through investment in community services and cutting the flow of drugs into prisons. The department also said Wales receives more than £3.4m for services spanning prisons, probation, and courts to support prison leavers with addiction, and that prisoners at risk of homelessness can be offered temporary accommodation.
Women, Ethnic Disparities, and the Burden Beyond Overdose
The report extends beyond mortality alone. More than a third, or 39%, of custodial sentences given to women in Wales in 2025 were for thefts from shops, reflecting the extent to which low-level offending can sit beside severe social need, addiction, and poverty. Black people from Wales also remained the most overrepresented ethnic group in the prison population in 2025, with 58 black people in prison per 10,000 of the population compared with 15 white people per 10,000.
Those figures matter because they identify where the system is concentrating harm. Drug-related death, homelessness on release, and disproportionate imprisonment do not occur in isolation. They reveal a cycle in which poverty, substance use, and criminal justice involvement reinforce one another. If policy only reacts at the point of arrest or relapse, it arrives too late. The biological and social risk is already built in by the time a person walks out of prison.
Jones called on the UK and Welsh governments to find a solution to what he described as a tragic situation. The report’s central limitation is also its central warning: the data describe a severe pattern, but they do not repair the missing links between custody, probation, housing, and treatment. Until those links are addressed directly, the next release will still carry the same risk of overdose, homelessness, and preventable death.