Caseloads, culture, and capacity: rethinking investigative policing

Police detective functions in England and Wales are straining under converging pressures. Drawing on 45 semi-structured interviews with detectives across five police forces, this paper examines how rising caseloads, proliferating digital evidence, and attenuated supervisory support interact with the College of Policing’s (CoP) Professionalising Investigation Programme (PIP). Although conceived to standardise and elevate investigative practice, more than 20 years on, PIP is experienced widely as an additional administrative weight that diverts time from inquiry, accelerates burnout, and reduces the role’s appeal; a dynamic we term the paradox of professionalisation. PIP is not the source of these pressures but intensifies them, compounding the high workloads, stress, and skills shortages already undermining detective capacity. Our analysis reframes investigative capacity as a composite of experience, team stability, mentoring, and digital infrastructure rather than raw head-count. It situates detectives’ concerns within evidence that police organisations worldwide are struggling to match seemingly limitless investigative demand with finite specialist expertise. The CoP’s recently announced review of PIP renders these findings especially salient, positioning the study as timely empirical input for reforms aimed at sustaining investigative quality, safeguarding detective wellbeing, and restoring public confidence in criminal investigations.