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The purpose of this paper is to give an account for preparative collaboration between the police and municipal eldercare in Sweden concerning missing persons with dementia.

Design/methodology/approach used was a qualitative case study design, consisting of one focus group with representatives for the participating organisations, followed by directed content analysis.

The findings showed a lack of current collaboration and reluctance to new collaborative initiatives. However, when focussing on preparative collaboration of coordinated responses to missing incidents, possibilities for improvement could be identified. The improvements concerned updated personnel response checklists, along with suggestions for an elaborate life story document in eldercare, with police access. Finally, better coordination of the return of the found person and a follow up were proposed.

It is suggested that collaboration must be given different meanings and use different approaches adapted to the different phases in a rescue operation. In the preparation and the response phase, the focus should be on coordination of the resources available. In the pre-planning and prevention phases, as well as in evaluation and learning, horizontal collaboration is more suitable. The amount of data in this study is a research limitation which calls for further research.

It is suggested that collaboration must be given different meanings and use different approaches adapted to the different phases in a rescue operation. In the preparation and the response phase, the focus should be on coordination of the resources available. In the pre-planning and prevention phases, as well as in evaluation and learning, horizontal co-operation is more suitable.

The originality/value of this paper can be found in the novelty of missing person research in Sweden, and in practical suggestions for preparative collaboration concerning persons with dementia who go missing. Finally, it can be found in the suggested need for a more dynamic and process-sensitive view of collaboration in SAR or rescue operations.

The purpose of this paper is to address the complexity of missing persons cases and highlight the linguistic differences that arise in this type of crime. Missing persons cases are typically very complex investigations. Without a body, crime scene forensics is not possible, and police are often left only with witness and suspect statements. Forensic linguistics methods may help investigators to prioritise or remove suspects. There are many competing approaches in forensic linguistic analysis; however, there is limited empirical research available on emerging methods.

This research investigates Statement Analysis, a recent development in linguistic analysis that has practical applications in criminal investigations. Real-world statements of individuals convicted of or found to be not guilty of their involvement in missing persons cases were used in the analyses. In addition, Behaviour Sequence Analysis was used to map the progressions of language in the suspects' statements.

Results indicated differences between the guilty and innocent individuals based on their language choices, for example, guilty suspects in missing [alive] cases were found more likely to use passive language and vague words because of high levels of cognitive load associated with the several types of guilty knowledge suspects in missing persons cases possess. Of particular interest is the use of untruthful words in the innocent suspects’ statements in missing [murdered] cases. While typically seen in deceptive statements, untruthful words in innocent statements may result because of false acquittals.

This research provides some support for Statement Analysis as a suitable approach to analysing linguistic statements in missing persons cases.

The purpose of this paper is to test the “power few” concept in relation to missing persons and the locations from which they are reported missing.

Data on missing persons’ cases (n = 26,835) were extracted from the record management system of a municipal Canadian police service and used to create data sets of all of the reports associated with select repeat missing adults (n = 1943) and repeat missing youth (n = 6,576). From these sources, the five locations from which repeat missing adults and youth were most commonly reported missing were identified (“power few” locations). The overall frequency of reports generated by these locations was then assessed by examining all reports of both missing and repeat missing cases, and demographic and incident factors were also examined.

This study uncovers ten addresses (five for adults; five for youths) in the City from which this data was derived that account for 45 percent of all adults and 52 percent of all youth missing person reports. Even more striking, the study data suggest that targeting these top five locations for adults and youths could reduce the volume of repeat missing cases by 71 percent for adults and 68.6 percent for youths. In relation to the demographic characteristics of the study’s sample of adults and youths who repeatedly go missing, the authors find that female youth are two-thirds more likely to go missing than male youth. Additionally, the authors find that Aboriginal adults and youths are disproportionately represented among the repeat missing. Concerning the incident factors related to going missing repeatedly, the authors find that the repeat rate for going missing is 63.2 percent and that both adults and youths go missing 3–10 times on average.

The study results suggest that, just as crime concentrates in particular spaces among specific offenders, repeat missing cases also concentrate in particular spaces and among particular people. In thinking about repeat missing persons, the present research offers support for viewing these concerns as a behavior setting issue – that is, as a combination of demographic factors of individuals, as well as factors associated with particular types of places. Targeting “power few” locations for prevention efforts, as well as those most at risk within these spaces, may yield positive results.

Very little research has been conducted on missing persons and, more specifically, on how to more effectively target police initiatives to reduce case volumes. Further, this is the first paper to successfully apply the concept of the “power few” to missing persons’ cases.

Missing person cases are a global issue impacting policing. Among these, those who abscond from hospitals are especially concerning because these reports require collaboration across services, often strain already limited police and hospital resources and present an elevated level of possible harm due to high prevalence of mental illness, disability and/or addiction. Despite this, to-date, there has been a lack of scholarly attention on this phenomenon from a policing perspective. The present study aims to fill this gap by exploring how far missing hospital patients travel and where they are commonly found.

Using a sample of 731 closed case files (2014–2018) from one police service, we identify spatial behaviour patterns specific to this group of missing persons.

Results suggest that most do not leave the hospital grounds or stay within a 5-km radius. Others were found close to the hospital, within city limits and/or returned of their own volition. By identifying these spatial behaviour patterns associated with missing hospital patients, police can refine probable search areas, allocate resources more efficiently, find the missing faster and develop better-informed responses and collaborative policies.

Our research represents the first empirical investigation into missing persons from hospital settings through a spatial perspective. Through descriptive statistical and spatial analyses, we determine the distance between the hospital a given individual was reported missing from and the location of where they were ultimately found.

The purpose of this paper is to improve the police, policy makers' and researchers' understanding of the likelihood of fatal outcomes befalling missing persons.

Data on the age, sex, duration missing and outcome (fatal or non‐fatal) of over 32,000 cancelled reports of missing persons were extracted from a police database of missing persons in the London metropolitan area. The analysis highlights the risk of a cancelled missing person report resulting in a fatal outcome by the same variables.

Shows that the risk of a cancelled missing person report resulting in a fatal outcome is overall very low, though it does increase with the age of the person reported missing and the duration they remain missing for. Males face a higher risk of being found dead than females.

The risk estimations use a base rate of all cancelled missing person reports, therefore excluding persons who have never being found. The estimations are based on missing person reports rather than individuals. Insufficient detail was available to analyse the fatal cases by type of death (e.g. suicide, homicide, accident, etc.).

This paper provides new empirical evidence on what happens to people reported missing. The findings provide an actuarial context in which clinical risk assessment by police officers can take place.

This paper aims to present the application of situation calculus for knowledge representation in missing persons investigations.

The development of a knowledge representation model for the missing persons investigation process based upon situation calculus, with a demonstration of the use of the model for a missing persons example case.

Situation calculus is valuable for knowledge representation for missing persons investigations, as such investigations have state changes over time, and due to the complexity of the differing investigation activities applicable to different situations, can be difficult to represent using simpler approaches such as tables or flowcharts.

Situation calculus modelling for missing persons investigations adds formalism to the process beyond that which can be afforded by the current use of text, tables or flowcharts. The additional formalism is useful in dealing with the uncertainty present in such investigations.

The implications are a simplification of the application of the current police guidelines, and thoroughness in the application of such guidelines for missing persons investigations via situation calculus modelling.

This paper supports the management of missing person investigations, by using the most critical variables in a missing persons investigation to determine relevant investigation and search activities applicable to the circumstances of a given case.

The novelty of the knowledge representation approach is the application of situation calculus via state and action vectors and a matrix of fluents to the process of missing persons investigations.

When investigating missing persons cases, witness and suspect statements are often the only available evidence to investigators. As such, forensic linguistics can be useful to police when seeking information from individuals during investigative interviews. The presumption of innocence must be maintained in an investigation, and therefore this study aims to use a method focused on veracity detection, rather than the majority of studies using deception detection approaches.

The current research uses criteria-based content analysis (CBCA), a method that has been applied to a variety of criminal cases. Real-world statements of individuals convicted or found innocent of their involvement in missing persons cases were used in the analyses. Additionally, behaviour sequence analysis (BSA) was used to map language patterns within individuals’ statements.

Results indicated that two individual markers occurred at a high frequency across all four groups (the guilty and innocent statements of both case types); however, differences were noted in the sequences based on an individual’s ability to provide experiential details.

The current research contributes to the growing literature that aims to test CBCA in adult samples across crimes that do not pertain to sexual abuse, in addition to aiding researchers and practitioners to understand better the linguistic differences that occur in missing persons cases.

To the best of the authors’ knowledge, this type of research, using CBCA to assist with missing person's cases with a temporal method (BSA), has never before been tested. BSA has previously been used in forensic linguistics, and shown support for the method. The current research builds on this in terms of missing persons cases.

International literature on missing persons suggests that a significant volume of missing person cases originate from hospitals and mental health units, resulting in considerable costs and resource demands on both police and health sectors (e.g., Bartholomew et al., 2009; Sowerby and Thomas, 2017). In the Canadian context, however, very little is known about patients reported missing from these locations – a knowledge deficit with profound implications in terms of identifying and addressing risk factors that contribute to this phenomenon. The present study is one such preliminary attempt to try to fill a significant research and policy gap.

The authors draw on data from a sample of 8,261 closed missing person reports from a Canadian municipal police service over a five-year period (2013–2018). Using multiple logistic regression, the authors identify, among other factors, who is most likely to be reported missing from these locations.

Results reveal that several factors, such as mental disabilities, senility, mental illness and addiction, are significantly related to this phenomenon. In light of these findings, the authors suggest that there is a need to develop comprehensive strategies and policies involving several stakeholders, such as health care and social service organizations, as well as the police.

Each year, thousands of people go missing in Canada with a large number being reported from hospitals and mental health units, which can be burdensome for the police and health sectors in terms of human and financial resource allocation. Yet, very little is known about patients reported missing from health services – a knowledge deficit with profound implications in terms of identifying and addressing risk factors that contribute to this phenomenon. This manuscript seeks to remedy this gap in Canadian missing persons literature by exploring who goes missing from hospitals and mental health units.

The purpose of this paper is to quantify the risk of fatality for men who are reported missing following a night out. Additionally, the paper aimed to develop search heuristics to inform the development of search strategies, through an examination of the key geographical points involved in these cases.

Cases were identified, and data collected, from online media sources supplemented with a request to UK police forces and a search of the UK Missing Persons Unit database. In total, 96 cases which occurred over a five-and-a-half-year period in the UK were included. The study compares the profile of fatalities that result from disappearances occurring in different types of geographical area. Location data were georeferenced allowing Euclidean distances between geographical locations to be generated.

In total, 60 per cent of disappearances lasting longer than 48 h resulted in fatality, rising to almost all cases after three days missing. In 89 per cent of cases bodies are recovered from water; 11 per cent on land after the individual died from a fall, hypothermia or a drugs overdose.

Search strategies can be informed by a consideration of the type of area the person was socialising (high night-time economy through to rural areas) and the geography of subsequent sightings.

In focusing on the specific circumstances of a disappearance rather than an individual’s personal characteristics, the paper offers an innovative approach to understanding risk (i.e. what is the likelihood of a particular outcome occurring) and the development of heuristics for search strategies in missing person cases.

This paper sets a case study of missing children in the Republic of Ireland against a review of international research to explore broader understandings and responses to the problem.

The study begins by reviewing the literature on pioneering American initiatives dating back to the 1970s and more recent literature from Great Britain where a series of high-profile scandals involving sexual exploitation of teenage girls provoked a number of controversial inquiries into the police and social work professions. The present study was prompted by an evaluation of the 116 000 Missing Children Hotline which was introduced to Ireland in 2012 under the auspices of the European Union (EU) Daphne III Programme by the Irish Society for the Prevention of Cruelty to Children (ISPCC).

The central conclusion emerging from analysis of the evidence is that Missing Children Hotlines remain rooted in representations of ‘stranger danger’ and disconnected from repeat runaway children who feature prominently in police reports from formal care settings or family homes and who are actively targeted by sexual predators and criminal gangs. The implications are that systemic change requires grounding in research strategies which combine police data with anthropological studies to give legitimacy to the voices of runway and sexually exploited children.

The study offers original international perspectives on missing children to epistemological research communities in the fields of social work, criminology and policing with recommendations that Missing Children and Runaway Safe-lines are targeted systemically at keeping runaway children, homeless children and at-risk-youth safe and off the streets.