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The system in England and Wales involves a joint agency response to the sudden and unexpected death of a child (SUDC) and, for various reasons, the police contribution to that investigation is sometimes inadequate. The purpose of this paper is to explore some of the dilemmas which explain this inadequacy.

The arguments presented in the paper are made on the basis of empirically derived findings, drawing from original research based upon qualitative interviews with nine senior detectives working in the areas of child abuse or major crime, as well as focus groups of senior detectives, and a limited contribution from pathologists.

This paper explores whether there is an investigative deficit in respect of potential child homicide when compared to an adult domestic homicide, and it concludes that in some areas the most vulnerable people in society may be at risk because of issues such as inadequate training, inflexible force policies and under-resourced police investigation of child death.

It is possible to kill a child and leave few, if any, physical clues on the body. To determine if homicide is the cause of death, the overall police investigation therefore has to be of high quality to identify any clues that have been left by the perpetrator at the scene or in other ways. It is usual for Child Abuse Investigation Unit detectives to investigate SUDC but they are often trying to do so with little training and few resources. Cuts to police service budgets since 2010 have affected all elements of policing, including Major Crime Teams. As a result, these teams are more discerning about which cases they take on and there is evidence they are not taking on child death investigations even if there are suspicions of homicide. The findings reveal important implications for police investigative training and a clear and significant deficit in the investigative resources available to the lead investigator on a SUDC investigation which may or may not be a homicide, compared with the resources available to the senior investigating officer on a straightforward domestic homicide when the victim is an adult. If homicide is missed, then siblings or future siblings with that family may be left at risk of harm. The College of Policing suggested standards for SUDC investigation are sometimes not being adhered to in respect of training and resources.

The paper is informed by original qualitative research conducted in 2019. The findings are of value to police policy makers, the College of Policing, and police senior leadership teams.

The purpose of this paper is to suggest two things: first, that the scientific and technological developments and increased regulation that have shaped homicide investigations in England and Wales over the last few decades have provided today’s investigators with opportunities not available to their predecessors, and play a key role in solving unsolved homicides. Second, however, the authors suggest that such developments have created new challenges for investigators, challenges that impede current investigations, potentially creating the future unsolved cases.

This paper draws on two qualitative studies that comprised over eight months of ethnographic research, observations, interviews with serving and retired homicide detectives and case file analysis.

The widespread changes to homicide investigations in England and Wales have been valuable in many respects, notably, they have allowed detectives to look back in time and bring longstanding unsolved cases to a close. However, change, although well intentioned, might actually be creating future cold cases as detectives endeavour to manage the volume of information now generated during investigations, fast evolving scientific and technological techniques and an increase in bureaucracy.

This study is helpful for: improving investigative practice; learning from change; reducing unsolved homicides vs a rise in new cold cases; and innovative and entrepreneurial investigators.

Utilising qualitative research, this paper contributes to the academic literature exploring homicide investigation in England and Wales, offering insight into the challenges facing detectives and the potential impact of these upon solving past and present homicide cases.

The purpose of this paper is to provide the reader with senior investigating officer (SIO) perspectives of their understanding of gang-related homicide and associated investigative challenges.

A phenomenological design was utilised in this study. In sum, 15 SIOs from the Metropolitan Police Service were interviewed using a semi-structured interview and analysed using thematic analysis.

It was found that the original typology of “gang homicide” might be too narrow and focus should be paid to “gang-related homicide”, characterised via motive behind the offence. This type of homicide exhibited specific characteristics (e.g. violent nature, large potential scene and pool of suspects) and investigative challenges which made it different from other types of homicide (e.g. complexity, need for more resources, managing unwilling witnesses, managing media interest, specific evidence challenges, need for thorough risk assessments). The need for expertise in the deployment of officers was highlighted and related to the desire for more continuing professional development (CPD).

Gang-related homicide is especially challenging, but due to its volume, SIOs in London developed a sort of “muscle memory” – something that other police services do not have, even though the “gang problem” is spreading outside of metropolitan areas. Support for changes (e.g. in the utility of community impact assessment) and non-standard procedures (e.g. consideration of covert operations early on) should be discussed in further training and manual development. More attention needs to be paid to the synthesis of experience, expertise and science, SIOs being especially interested in debriefs and CPD opportunities. Multi-agency training is key for homicide investigators, relating to the complex nature of gang-related homicide and relevant safeguarding issues. Resourcing is a clear issue relating to the increase in gang-related homicide, as well as its investigation.

This is the first research into investigative challenges of gang-related homicide in England and Wales, and the findings can be utilised by all police services who may be dealing with gangs in their area. The findings can also support calls for change and development within services.

Clearance rates for nonfatal shootings, especially cases involving gang- and drug-related violence, are disturbingly low in many US cities. Using data from a previously completed project in Boston, we explore the prospects for improving gang/drug nonfatal shooting cases by investing the same investigative effort found in similar gang/drug gun murder cases.

Our analyses primarily focus on a sample of 231 nonfatal shootings that occurred in Boston from 2010 to 2014. Logistic regressions are first used to analyze differences in the likelihood of case clearance for gang/drug nonfatal shooting cases relative to other nonfatal shooting cases. Independent samples t-tests are then used to compare the investigative characteristics of these two different kinds of nonfatal shootings. Next, independent samples t-tests are used to compare the investigation of gang/drug gun assaults relative to the investigation of very similar gang/drug gun homicides.

Results demonstrate that the odds of clearing gang/drug nonfatal shootings are 77.2% less likely relative to the odds of clearing nonfatal shootings resulting from other circumstances. This stark difference in clearance rates is not driven by diminished investigative effort, but investigative effort does matter. Relative to gang/drug gun assaults, gang/drug gun homicides have much higher clearance rates that are the result of greater investigative resources and effort that produces significantly more witnesses and evidence, and generate more forensic tests and follow-up investigative actions.

Gang- and drug-related violence generates a bulk of urban nonfatal shootings. Low clearance rates for nonfatal shootings undermine police efforts to hold offenders accountable, disrupt cycles of gun violence, and provide justice to victims. Police should make investments to improve investigative effort such as handling these cases with the same vigor as homicide cases.

The purpose of this paper is to begin to explore whether and how the use of detection avoidance (DA) by offenders leads to a so called “dark figure” of unsolved homicides that have been mis/unclassified.

Australian Coronial data and inquest findings are used to examine how DA impacts on determining homicide, and cases remaining unsolved.

Results show DA behaviours perpetrated by offenders may be catalysed by other challenges, and may lead to homicides being mis/unclassified and unsolved. Findings indicate there is a small dark figure of mis/unclassified homicides which eventually become known and investigated as homicides in Australia. The number of unsolved homicides may be greater than official data reveals, due to some cases remaining mis/unclassified.

Results are likely to underestimate the prevalence of mis/unclassified homicides due to the invisibility of cases and the difficulty establishing rules to include suspected but unproven homicides. The variable nature and impact of DA behaviours also limits results, along with jurisdictional differences in Coronial data.

This discussion explains DA behaviours impact on determining and investigating homicide and the necessity of future research.

Mis/unclassified homicides as unsolved homicides have not been discussed previously. This discussion is the first to conceptualise mis/unclassified homicides as a dark figure of unsolved cases, and the first to attempt to gauge the problem.

The use of the media in live cases has been explored in terms of its use and value to an investigation. However, it is unclear as to whether engaging with the media in cold-case investigations results in a positive or negative reception, and what impact this can have on a case’s possibility for progression. Because of the passage of time and a lack of, or a failed, prosecution means that the approach to media use needs to be different. The purpose of this paper is to explore how the media could be used as an investigative resource for cold cases.

This study is a result of a 7-month observation period with a 2-force collaborative cold-case team in England, and supplemented with interviews with 12 experienced cold-case detectives. Using inductive thematic analysis, the themes identified allow an exploration of detectives’ use of the media and the effect that this has on progressing cases. Further, there is discussion as to whether the media’s involvement is positive or negative.

The overarching theme is that when using the media, cold-case detectives are met with a positive reception and interest. The media can be used to obtain information, particularly in cases with minimal information, and it is important to use murder-anniversaries to obtain help from the public. However, this needs to be a carefully managed strategy as the media coverage can be negative, including inaccurate or inappropriate reporting which can be of detriment to the investigation.

To the best of the author’s knowledge, this is the first paper to explore how cold-case detectives have used the media to progress cases, and the findings demonstrate that when the public are encouraged to come forward with information, there is a better chance of case progression. Further research is required to explore how all cold cases can receive appropriate coverage.

The study aims to examine the effect of detective experience on the likelihood of clearing a homicide, while controlling for additional extralegal and case/investigative characteristics.

This study uses homicide and policing data collected from case files in a mid-sized US city. Detective experience is measured in multiple ways. Analytical models include extralegal variables, case characteristics, and proxies of investigative quality as controls. The study uses logistic regression with a dichotomous clearance outcome.

The results suggest a robust and significant inverse relationship between the years spent as a homicide detective and the likelihood of case closure. However, years of experience with the department overall has a significant and positive relationship to clearance. Investigation-related variables and case characteristics contribute more to model explanatory power than extralegal factors.

The potential role of experience has not been fully explored, with contradictory findings over time. This work builds on previous research to highlight the potential role of experience in clearing cases, while questioning previous assumptions tied to the belief that more experience improves investigative outcomes.

Detective work is a mainstay of modern law enforcement, but its effectiveness has been much less evaluated than patrol work. To explore what is known about effective investigative practices and to identify evidence gaps, the authors assess the current state of empirical research on investigations.

The authors assess the empirical research about the effectiveness of criminal investigations and detective work in resolving cases and improving clearance rates.

The authors’ analysis of the literature produced 80 studies that focus on seven categories of investigations research, which include the impact that case and situational factors, demographic and neighborhood dynamics, organizational policies and practices, investigative effort, technology, patrol officers and community members have on case resolution. The authors’ assessment shows that evaluation research examining the effectiveness of various investigative activities is rare. However, the broader empirical literature indicates that a combination of organizational policies, investigative effort and certain technologies can be promising in improving investigative outcomes even in cases deemed less solvable.

From an evidence-based perspective, this review emphasizes the need for greater transparency, evaluation and accountability of investigative activities given the resources and importance afforded to criminal investigations.

This review is currently the most up-to-date review of the state of the research on what is known about effective investigative practices.

The anger/sadistic model is one of several typologies proposed for sexual homicide events. This paper aims to empirically test this model by examining sexual homicide cases. Empirically validating these typologies provides greater validity and reliability toward the sexual homicide classification systems that are useful in police investigations.

Secondary data analysis was conducted using police data on 249 solved sexual homicide cases in Canada from 1948 to 2010. Through a robust classifying method, latent class analysis was used to examine variables from the anger/sadistic typology. Additionally, variables from the pre-crime, crime and post-crime phases were examined in relation to the classes’ external validity.

Three classes emerged, namely, expressive, methodical and instrumental. Expressive and methodical were similar to the anger/sadistic model in terms of the presence of premeditation, victim-offender relationship and body disposal location. Instrumental was characterized by the absence of mutilation on the victim’s body, targeted acquaintances and the use of physical restraints. The three-class typology resembled evidence found in a previous systematic review and also reinforced the notion of heterogeneity in sexual homicide offenses.

This is the first study to empirically test the anger/sadistic typology. Such validation is important given that sexual homicide classification systems can aid in police investigations (e.g. narrowing down the list of potential suspects). Replication of studies is needed to lend credibility to research processes, which, in turn, allows practitioners and policymakers to integrate the results into policies effectively.

This paper addresses the clearance of aggravated assaults (AAs). Specifically, the authors consider variations in these clearances over time for large agencies and test which crime, investigation and agency factors are associated with the likelihood of clearance by arrest or exceptional means. In doing this work, they seek to extend the understanding of how police can improve their investigations and ability to solve serious offenses.

Using case, investigative and organizational data collected from seven large police departments selected on the basis of their trajectory of index crime clearances, and measures of case characteristics, investigative effort and organizational best practices, this paper uses descriptive and inferential statistics to analyze AA investigations and case clearance.

Key findings include the following: trajectories of AA clearance vary across large agencies and covary with a measure of organizational best practices, and the relationship between investigative effort and case clearance can depend on organizational practices. The authors find that measures of investigative effort are either not related to case clearance or there is a negative association.

Now that police researchers have a better understanding of AAs and their investigations, they need to test how this knowledge can be used to improve the quality of police investigations. Tests, preferably multi-agency randomized control trials, of new investigative strategies and organizational practices are needed.

This research is original in that it uses a multi-agency sample and crime, investigation and organizational measures to understand AA clearance.