The initial enthusiasm for the evidence-based policy agenda has recently been replaced with increasing scepticism. Critics point out that 'policy-based evidence' characterises the relationship more accurately. Analysing the role and nature of evidence in the context of UK drug policy and drawing on a range of theories of the policy process and research utilisation, this book pursues an alternative route for conceptualising the evidence and policy connection, which moves beyond zero-sum statements of evidence-based policy and policy-based evidence. It will be essential reading for students and researchers in public policy and criminology.