Report
National Audit Office (NAO); 2026.
https://www.nao.org.uk/reports/the-costs-of-tackling-drug-harms-in-prisons/
(This report focuses on how the prison and health services are using public funds to tackle drug harms in prisons. It highlights widespread drug use, rising security threats, and major gaps in investment, coordination, and service delivery.)
Freely available online