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Bacon, Matthew and Glasspoole-Bird, Helen and Hendrie, Nadine and Lewer, Dan and Mills, Ashley and Monaghan, Mark and Pascual, Guillermo and Quinton, Paul and Smith, Rivka and Sutton, Charlie and Williams, Emma and Stevens, Alex (2026) Implementation fidelity matters: insights from a realist evaluation of police drug diversion schemes in England. Policing and Society , Early online .