KEY FINDINGS FROM OUR INQUIRYThe evidence heard points to an urgent need for systemic reform, combining strong public-health leadership, integrated governance, and adequately resourced services.Substance misuse remains a systemic challenge across the prison estate, affecting safety, health outcomes and rehabilitation prospects.The Committee found clear evidence that drug use in custody is closely linked to mental-health service inadequacy, social disadvantage and lack of purpose.Enforcement alone cannot address these issues; a whole-system, public-health approach is required, underpinned by equal access to treatment and recovery...