Offence-specific scripts among juvenile deliberate firesetters: a possible explanation for fire proclivity.

The study employed inductive-thematic analysis to identify dynamic cognitive-emotional processes occurring in proximity to deliberate firesetting among a sample of N = 35 adjudicated juvenile firesetters. Six fire-specific themes were determined. Three of these themes are akin to an implicit theory (i.e. a belief system informed by previous experiences): Fire Interest, Fire is Controllable, and Fire Denial/Accidental. Three of these themes are consistent with a cognitive script (i.e. a behavioural guide for how and when to use fire): (a) fire is destructive; (b) fire conceals evidence; and (c) fire creates calm. When reviewed more closely, the theme 'fire is destructive' is composed of two separate subcategories: 'fire creates destructive fun' and 'fire is a destructive tool for revenge'. The findings have risk assessment and treatment implications for juvenile firesetters.

Use of CO-oximetry to confirm carboxyhemoglobinemia in cats involved in secondary arson homicide.

The body of a deceased human and 4 deceased cats were found in a house while a fire was being extinguished. As a result of these findings, arson, homicide, and animal death investigations were opened. As part of the animal death investigation, all of the cats were submitted for veterinary forensic autopsies. All cats had soot on the fur and had soot deposits within the oral cavity, esophagus, and respiratory tract. Two cats had soot within the stomach. Cardiac blood was analyzed for carboxyhemoglobin using a CO-oximeter, and all cats had levels >65%. The cause of death was determined to be due to toxic smoke inhalation from the structure fire. Case findings support the potential use of CO-oximeter for determination of carboxyhemoglobin levels in cats and continued research in this area of forensic practice.

The Adapted Firesetting Assessment Scale: reliability and validity.

BACKGROUND: The Adapted Firesetting Assessment Scale was developed for use with adults with developmental disabilities targeting fire-related factors thought to be associated with deliberate firesetting behaviour (i.e. attitudes towards fire, fire interest, fire normalisation, identification with fire and fire safety awareness). However, the psychometric properties of the scale are yet to be evaluated. METHOD: The reliability, validity, comprehensibility, relevance and comprehensiveness of the Adapted Firesetting Assessment Scale were evaluated. Fifty-nine adults with developmental disabilities, some of whom had a history of firesetting, completed the Adapted Firesetting Assessment Scale on two occasions. Feedback about the questionnaire was sought from both participants and professionals. RESULTS: The AFAS has acceptable internal consistency and excellent test-retest reliability. The attitudes towards fire, fire normalisation, poor fire safety subscales and total scores discriminated firesetters from non-firesetters. Content analysis of feedback indicated items of the AFAS were understood, relevant, accessible and comprehensible. CONCLUSION: A larger study is needed to examine the factor structure of the AFAS.

The development of the Adapted Firesetting Assessment Scale.

BACKGROUND: Treatment for adults who set fires relies upon valid and reliable assessment. Research is needed to ensure self-report measures are available for adults with neurodevelopmental disabilities and that they are robust. METHOD: Qualitative and quantitative data from three rounds of a Delphi exercise with practitioners and a focus group discussion with adults with neurodevelopmental disabilities were used to generate consensus about the accessibility of item adaptations made to the Fire Interest Rating Scale, Fire Attitudes Scale, and the Identification with Fire Questionnaire. RESULTS: Findings suggested the accessibility of current measures could be improved to better meet the needs of adults with neurodevelopmental disabilities and adaptations to all questionnaire items were needed. CONCLUSION: Following feedback, revisions to current measures were implemented leading to the development of the Adapted Firesetting Assessment Scale with improved accessibility for adults with neurodevelopmental disabilities.

The use of liquid latex for detecting traces of blood following thermal exposure.

In cases of crimes involving blood, the perpetrators often attempt to remove the traces they have left behind. Setting fire to the crime scene, aside from cleaning measures, seems to achieve this goal and presents a major challenge for crime scene investigators. There is only very little published information available on the effect of fire and extreme heat on blood and the detection thereof. After exposure to high temperatures of or exceeding 1.000 °C, blood is deemed to be undetectable. This study exposed 11 different potentially crime-relevant objects using a standardized and controlled procedure to temperatures of 300 °C, 700 °C, and 1.000 °C documenting the influence of heat on bloodstains and the detection of blood. The results of the forensic collection of blood traces with and without liquid latex confirmed the advantage of using the latex method. Almost all objects showed a clear luminescence-caused visualization of traces of blood after removing the soot with a latex lift. There were also fewer false positive results than in tests not using latex.

Australian arsonists: an analysis of trends between 1990 and 2015.

There have been few studies to date focused on identifying the characteristics of Australian arsonists, and a distinct absence of any analyses of trends in arson offending over time. In order to address this gap, the current study reviewed sentencing transcripts obtained across all Australian jurisdictions between 1990 and 2015, to identify trends in the features of arson offending and key characteristics of the arsonists, over this 25-year period. Offender characteristics such gender, motivation, Indigenous status and degree of exclusivity-versatility of the arson offending were considered. Trend analyses indicated substance use, mental illness and female gender to be increasingly significant factors in the commission of arson offences over time. Significant differences were identified between Indigenous and non-Indigenous arsonists, which raises questions as to the adequacy of current theory to explain firesetting in this group.

Detection of blood and DNA traces after thermal exposure.

The analysis of blood traces is often of significant reconstructive and evidence-gathering importance. Perpetrators deliberately set fires to destroy evidence. There is little literature regarding the effect of fire and extreme heat on blood and the detection of blood. Blood and DNA are believed to be no longer traceable after exposure to a temperature of 1000 °C. This study exposed different objects of a standardized procedure to temperatures of 300, 700, and 1000 °C. It documented the influence of heat on blood traces through the use of luminol. DNA analysis confirmed that fewer DNA profiles can be created with increasing temperature. However, even after exposure up to a max. of 1000 °C, it was still possible to produce a complete DNA pattern from approx. 60% of the samples. Consequently, crime scenes that have been destroyed by fire should be evaluated with the same attention to detail as the unburned areas.

Study of the Weathering Process of Gasoline by eNose.

In a fire investigation the rapid detection of the presence of ignitable liquids like gasoline is of great importance as it allows appropriate treatment of the remains, the identification of prevention methods and detects the possible presence of an arsonist. In some cases, analysts cannot access the fire scene in the first few hours due to the dangers involved in the situation and, as a consequence, phenomena such as weathering start. Ignitable liquid weathering is an evaporation process that results in an increase in the abundance of non-volatile compounds relative to volatile compounds, and this process changes the chemical composition. In the present work, the weathering of samples of gasoline at different times (from 0 h to a month) has been studied using an electronic nose (eNose). The influence of the volume used (40 µL and 80 µL) and the type of support (cork, wood, paper and cotton sheet) has been studied. Chemometric tools have been used with the aim of ascertaining the weathering time for which the developed method is capable of detecting the presence of gasoline. The eNose was able to discriminate samples of weathered gasoline. The support used for the samples did not seem to have an influence on the detection and the system.

An evaluation of a specialist firesetting treatment programme for male and female mentally disordered offenders (the FIP-MO).

Individuals who set deliberate fires are frequently encountered by clinicians working in forensic mental health services. However, little attention has been paid to developing standardised treatment for this behaviour, and few evaluations of treatment have been conducted in forensic mental health services. This study evaluates a new standardised group cognitive behavioural treatment programme for individuals residing in forensic psychiatric hospitals who have engaged in deliberate firesetting (The Firesetting Intervention Programme for Mentally Disordered Offenders; FIP-MO). Sixty-three male and female patients with a history of deliberate firesetting commenced FIP-MO treatment. Patients who met the referral criteria for treatment but who resided at hospitals where FIP-MO treatment was not available were recruited as a treatment as usual comparison group. The treatment group completed a battery of psychometric assessments pre- and post-treatment, with the comparison group completing these at similar time points. Results showed that patients who completed the FIP-MO made significant improvements post-treatment, relative to the comparison group on fire-related measures (e.g., problematic interest and associations with fire) and anger expression. Further, effect size calculations showed that the treatment group made larger pre-post treatment shifts on the majority of outcome measures compared to the comparison group. These findings suggest that FIP-MO treatment is effective for reducing some of the key factors associated with deliberate firesetting.

Acid alteration of several ignitable liquids of potential use in arsons.

Ignitable liquids such as fuels, alcohols and thinners can be used in criminal activities, for instance arsons. Forensic experts require to know their chemical compositions, as well as to understand how different modification effects could impact them, in order to detect, classify and identify them properly in fire debris. The acid alteration/acidification of ignitable liquids is a modification effect that sharply alters the chemical composition, for example, of gasoline and diesel fuel, interfering in the forensic analysis and result interpretation. However, to date there is little information about the consequences of this effect over other accelerants of interests. In this research paper, the alteration by sulfuric acid of several commercial thinners and other accelerants of potential use in arsons is studied in-depth. For that purpose, spectral (by ATR-FTIR) and chromatographic (by GC-MS) data were obtained from neat and acidified samples. Then, the spectral and chromatographic modifications of each studied ignitable liquid were discussed, proposing several chemical mechanisms that explain the new by-products produced and the gradual disappearance of the initial compounds. Hydrolysis, Fischer esterification and alkylation reactions are involved in the modification of esters, alcohols, ketones and aromatic compounds of the studied ignitable liquids. This information could be crucial for correctly identifying these accelerants. Additionally, an exploratory analysis revealed that some of the most altered ignitable liquid samples might be very similar with each other, which could have impact on casework.

Fire-setting performed in adolescence or early adulthood predicts schizophrenia: a register-based follow-up study of pre-trial offenders.

BACKGROUND: Aggressive and disruptive behaviours often precede the onset of serious mental illnesses. Fire-setting is a type of crime that is associated with psychotic disorders. AIM: The aim of this prospective follow-up study was to investigate if fire-setting performed in adolescence or early adulthood was associated with future diagnoses of schizophrenia or schizoaffective disorder. METHODS: The consecutive sample consisted of 111 Finnish 15-25-year old males with fire-setting crimes, decreed to a pre-trial forensic psychiatric examination in 1973-1998, and showing no past nor current psychosis at the time of examination. For each firesetter, four age-, gender-, and place of birth-matched controls were randomly selected from the Central Population Register. The subjects were followed until the death of the individual, until they moved abroad, or until the end of 2012. RESULTS: Fourteen firesetters (12.6%) and five controls (1.1%) were diagnosed with either schizophrenia or schizoaffective disorder later in life, corresponding to a hazard ratio of 12.5. The delay between the fire-setting offense and the future diagnosis was on average nearly 10 years. CONCLUSIONS: Young male offenders undergoing a forensic psychiatric examination because of fire-setting crimes had a significant propensity for schizophrenia and schizoaffective disorder. Accurate assessments should be made both during imprisonment and later in life to detect possible psychotic signs in these individuals.

The effect of temperature on arson incidence in Toronto, Ontario, Canada.

Studies of crime and weather have largely excluded arson from empirical and theoretical consideration, yet weather could influence arson frequency over short time frames, influencing the motivation and activity of potential arsonists, as well as the physical possibility of fire ignition. This study aims to understand the role of weather on urban arson in order to determine its role in explaining short-term variations in arson frequency. We use data reported to the Ontario Fire Marshall's office of arson events in the City of Toronto between 1996 and 2007 to estimate the effect of temperature, precipitation, wind conditions and air pressure on arson events while controlling for the effects of holidays, weekends and other calendar-related events. We find that temperature has an independent association with daily arson frequency, as do precipitation and air pressure. In this study area, cold weather has a larger influence on arson frequency than hot weather. There is also some evidence that extremely hot and cold temperatures may be associated with lower day-time arson frequency, while night-time arson seems to have a simpler positive linear association with temperature.

The net benefits of human-ignited wildfire forecasting: the case of Tribal land units in the United States.

Research shows that some categories of human-ignited wildfires might be forecastable, due to their temporal clustering, with the possibility that resources could be pre-deployed to help reduce the incidence of such wildfires. We estimated several kinds of incendiary and other human-ignited wildfire forecast models at the weekly time step for tribal land units in the United States, evaluating their forecast skill out of sample. Analyses show that an Autoregressive Conditional Poisson (ACP) model of both incendiary and non-incendiary human-ignited wildfires is more accurate out of sample compared to alternatives, and the simplest of the ACP models performed the best. Additionally, an ensemble of these and simpler, less analytically intensive approaches performed even better. Wildfire hotspot forecast models using all model types were evaluated in a simulation mode to assess the net benefits of forecasts in the context of law enforcement resource reallocations. Our analyses show that such hotspot tools could yield large positive net benefits for the tribes in terms of suppression expenditures averted for incendiary wildfires but that the hotspot tools were less likely to be beneficial for addressing outbreaks of non-incendiary human-ignited wildfires.

Study of acidified ignitable liquid residues in fire debris by solid-phase microextraction with gas chromatography and mass spectrometry.

The detection and identification of ignitable liquid residues in fire debris can be meaningful in fire investigations. However, background pyrolysis products and weathering hinder the identification and classification steps. In addition to those processes, the acidification of the ignitable liquids before the combustion process could make those tasks even more difficult. Nevertheless, there are no systematic studies assessing the extraction, analysis, and composition of acidified ignitable liquid residues obtained from fire debris. In this work, a method for the study of acidified ignitable liquid residues in fire debris by solid-phase microextraction with gas chromatography and mass spectrometry is proposed. This methodology has been evaluated, first with simulated solutions (gasoline/sulfuric acid mixtures set on fire under controlled conditions), and then with analysis of samples from real fire debris obtained from 18 chemical ignition Molotov cocktails made with sulfuric acid and three different ignitable liquids (two types of gasoline and diesel fuel). In addition, the extensive modifications observed in chromatograms of acidified ignitable liquid residues regarding neat and weathered samples were studied. These alterations were produced by the combustion and acidification processes. As a consequence, tert-butylated compounds are proposed as diagnostic indicators for the identification of acidified gasoline in fire debris, even in strongly weathered samples.

Unraveling the Inferno: An Arson Case Series.

Firesetting behaviors present multifaceted challenges that intersect the realms of mental health, law, and societal welfare. While distinct in nature, firesetting, arson, and pyromania collectively embody a spectrum of behaviors that cause harm with profound implications for mental health and legal system. Firesetting is a behavior, arson is a criminal offense, and pyromania is a classified psychiatric diagnosis. Nevertheless, the underlying motivations for these behaviors in the context of psychiatric symptomatoloty remain poorly understood. Arson alone exacts a staggering financial toll in the United States, emphasizing the urgent need to understand the reason behind these acts. Within legal contexts, mental health professionals frequently encounter individuals exhibiting firesetting behaviors while consulting on legal cases. The strong correlation between firesetting behavior and mental disorders shows a dire need for extensive and detailed collaboration between psychiatric experts, legal practitioners, and fire services. Here, we describe a series of firesetting cases and their ties to the mental health and legal systems underscoring the imperative for integrated, multifaceted approaches to address this pressing societal concern.

When fire burns the evidence - Lesson 1: It is not always what it seems.

When a charred corpse is found, a primary unavoidable phase of the subject's identification is performed. Then, the medico-legal investigation must clarify whether the charring occurred before or after death, and so establish a differential diagnosis between accidental, homicidal, or suicidal modality. We report three cases of charred corpses in which a death dynamic was initially suspected but subsequently disproved: a suicidal intoxication in arson at first thought to be homicidal strangulation, a suicidal hanging revealed by neck haemorrhages in a suspected accidental fire, a femicide through ligature strangulation concealed with the simulation of a car accident. Many of the events are accidental, related to fires or traffic accidents. However, it must be considered that charring following a murder was deliberately provoked to prevent the identification of the subject and to conceal evidence of how the murder occurred. Because of the complex operational conditions in the study of a charred corpse, all the diagnostic tools proper to forensic science should be held beyond the preliminary circumstantial suggestions. We aim to emphasise the importance of a multidisciplinary approach since the solution of the three cases was possible thanks to the combination of crime scene investigation, radiological exams, autopsy, and histopathological and genetic analysis.

Mental illness and psychiatric treatment amongst firesetters, other offenders and the general community.

OBJECTIVE: Firesetting is often reported to be associated with psychopathology, but frequently these conclusions are based on studies reliant on selective forensic psychiatric samples without the use of comparison groups. The aim of the study was to examine the rates of mental illness, substance use disorders, personality pathology and psychiatric service usage in a population of convicted firesetters compared with other offenders and community controls. METHOD: Using a data-linkage design, the study examined the psychiatric histories and usage of public mental health services by 1328 arsonists convicted between 2000 and 2009 in Victoria, Australia. These were compared with 1328 matched community controls and 421 non-firesetting offenders. RESULTS: Firesetters were significantly more likely to have been registered with psychiatric services (37%) compared with other offenders (29.3%) and community controls (8.7%). The firesetters were also more likely to have utilised a diverse range of public mental health services. Firesetters attracted psychiatric diagnoses more often than community controls and other offenders, particularly affective, substance use, and personality disorders. CONCLUSIONS: This study confirms that there is a link between firesetting and psychopathology, suggesting that there is a role for the psychiatric screening of known firesetters, and a need to consider psychopathology in formulating the risk for further firesetting.

Fire accelerant classification from GC-MS data of suspected arson cases using machine-learning models.

Using a practical GC-MS dataset containing approximately 4000 suspected arson cases, three machine-learning based classification models were developed and their performances were evaluated. All models trained for classifying the data from fire residue into six categories; no fire accelerants detected or else one of fire accelerants was used within gasoline, kerosene, diesel, solvents, or candle. The classification accuracies of the random forest, supporting vector machine, and convolutional neural network model were 0.88, 0.88, and 0.92, respectively. By calculating feature importance of the random forest model, several potential chemical fingerprints of fire accelerants were discovered.

Review: Recent advancements and moving trends in chemical analysis of fire debris.

This review describes recent advances and current trends in fire debris analysis from 2014 to 2021. Onsite analytical techniques used for fire scene investigation, identifying samples of interest for later analysis as well as onsite confirmatory techniques are examined. Laboratory techniques are reviewed both from a perspective of instrumentation and data analysis. Advances in analytical techniques include GC x GC-TOFMS, DART-MS, HS-GC-IMS. New and emerging methods of data analysis including those using machine learning are assessed. Each aspect is essential for forensic scientists to obtain the correct conclusion when collecting, examining, analysing, and interpreting fire debris. This review concludes that there is a need for the validity and certainty of all methods to be assessed if they are to be used to generate reports or draw conclusions.

Intervention for Firesetting Offenders: A Case Study.

There is little research on treatment for firesetting, especially for those who were incarcerated for their offenses. Of the treatment programs that do exist, there are limitations to feasibly implementing these in correctional settings. We propose a short-term (eight-session) program, Intervention for Firesetting Offenses (INFO), based on techniques that have been empirically supported for this population, including psychoeducation, motivational interviewing, cognitive behavioral therapy-based strategies, and relapse prevention. We provide a description of INFO using the case study of Mr. A, a man who was incarcerated for an arson offense. Overall, INFO was feasibly and effectively implemented, as the individual improved his understanding of firesetting in general and his own motivations and risk factors for engaging in firesetting and developed a relapse prevention plan to avoid future offending behaviors.