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There is a surprising lack of underpinning evidence relating to how police specialism is defined, conceived and operationalised nationally. This study aims to shed light on the development of specialism, adding insights towards academic and police knowledge on the topic.

Exploratory research was conducted to draw evidence on police specialism in England and Wales according to publications in the literature and insights from high-ranking police officers. A total of 57 documents and 10 officers’ accounts were thematically analysed. Five main themes have been identified, relating to the development, impact and barriers of specialist units, knowledge and training.

Socio-cultural, policy-based and historical information that contributed to the development of specialism in its contemporary form were discussed. The conceptual triggers for the institution of most specialist units were disasters and a need for modernisation. In both cases, police forces were faced with the inability to keep up with emerging threats and new criminal techniques. Some exceptions apply, with specialisms of sex offences still being underdeveloped and underfunded compared to other crimes. Overall, although specialism has the potential to positively impact police efficacy, the specialist knowledge of officers working within specialist units is frequently inferred – rather than measured.

Organisational support and the quality of training impact specialism effectiveness. The substantial lack of resources allocated to specialism means that training for some crime types is either unavailable or difficult to complete. Police officers fear that specialism might lead to elitism and corrupt police practices. There is no evidence, however, that elitist beliefs are the direct result of specialism or rather additional co-occurring organisational, cultural and force-specific or role-dependant factors. Police officers’ wellbeing and specialist capacity take a significant toll.

To the best of the authors’ knowledge, this was the first modern study of its kind that investigated how police specialism is conceived, instituted and prioritised in England and Wales.

Several studies have been conducted to understand why the conviction rate for rape and serious sexual offences (RASSO) remains so low. Increasing pressure and criticism have led to questioning why improvements in RASSO investigations are proving ineffective. The purpose of this study was to capture police officers’ perspective of police specialism while investigating RASSO.

A total of 82 semi-structured interviews were conducted. Data collection spanned across two years, from October 2021 until May 2023, and included police officers from four police forces in England and Wales. Template analysis was used to identify recurrent patterns around police specialism for RASSO.

Most officers viewed specialism as a tool to improve how police forces prevent and tackle RASSO. In spite of this, the lack of prioritisation of specialist training, roles and units specifically for this crime type has hindered the development of evidence-based practice in policing. The impact on well-being, resources, organisational support and role identity has been explored.

This is the first qualitative study, to the best of the authors’ knowledge, to look at officers’ insights on police specialism for RASSO in England and Wales. Officers discussed day-to-day challenges associated with conducting RASSO investigations while reflecting on potential advantages related to dedicated specialist units and/or specialist roles.