Canadian Society of Forensic Science Journal最新文献

{"title":"Volatile organic compounds of diesel and porcine bone in a simulated controlled fire","authors":"Dheephikha Kumaraguru, Khairul Osman, N. Hamzah, W. N. S. M. Desa, Gina Francesca Gabriel","doi":"10.1080/00085030.2023.2172128","DOIUrl":"https://doi.org/10.1080/00085030.2023.2172128","url":null,"abstract":"Abstract The detection of burned human remains in a fire is daunting, mainly when identifiable skeletons are not found. This study aims to identify volatile organic compounds (VOC) released from the burning of porcine bones in the presence of diesel in a simulated controlled outdoor setting in Malaysia. Neat diesel was diluted with hexane with a ratio of 1:1 and administered into a gas chromatography-mass spectrometry (GC-MS). Porcine bone was burned to identify VOCs of porcine bones, whereas 30 mL diesel was burned together with porcine bones to identify VOCs produced from the combined burning. After the burning process, an activated carbon tablet was fixed to the burned sample. Later, the tablet was desorbed with hexane and analysed using GC-MS. Results revealed that the combined burning released a set of VOCs that were not detected in burned porcine bone or neat diesel. This work was able to enforce the detection of specific volatiles from various functional groups such as alkanes, isoalkanes, alkylbenzenes and ketones in the combined burning of diesel with porcine bones. It was also discovered that in the specific conditions applied and controlled in this study, most VOCs of porcine bone and diesel respectively were not detected in the combined burning of porcine bone and diesel. Résumé La détection de restes humains brûlés lors d’un incendie est une tâche ardue, surtout lorsque des squelettes identifiables ne sont pas retrouvés. Cette étude vise à identifier les composés organiques volatils (COV) libérés par la combustion d’os de porc en présence de diesel dans un environnement extérieur contrôlé simulé en Malaisie. Le diesel pur a été dilué avec de l’hexane dans un rapport de 1:1 et introduit dans un chromatographe en phase gazeuse avec spectrométrie de masse (GC-MS). Des os de porc ont été brûlés pour identifier les COV, tandis que 30 ml de diesel ont été brûlés en même temps que les os de porc afin d’identifier les COV produits par la combustion combinée. Après le processus de combustion, une pastille de charbon actif a été fixée sur l’échantillon brûlé. La tablette a ensuite été désorbée avec de l’hexane et analysée par GC-MS. Les résultats ont révélé que la combustion combinée libérait une série de COV qui n’ont pas été détectés dans l’os de porc brûlé ou dans le diesel pur. Ce travail a permis de confirmer la détection de substances volatiles spécifiques provenant de divers groupes fonctionnels tels que les alcanes, les isoalcanes, les alkylbenzènes et les cétones dans la combustion combinée de diesel et d’os de porc. Il a également été découvert que dans les conditions spécifiques appliquées et contrôlées dans cette étude, la plupart des COV de l’os de porc et du diesel n’ont pas été détectés dans la combustion combinée d’os de porc et de diesel.","PeriodicalId":44383,"journal":{"name":"Canadian Society of Forensic Science Journal","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42311599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Accuracy of impact angle determinations from bullet holes in drywall panels","authors":"Adrian Santangelo, Eugene Liscio, Kimberly Nugent","doi":"10.1080/00085030.2023.2169478","DOIUrl":"https://doi.org/10.1080/00085030.2023.2169478","url":null,"abstract":"Abstract When a bullet strikes a surface such as a drywall panel, it may perforate the material leaving a hole in the surface or it may ricochet. When multiple bullet impacts exist, for example through a wall section, the probing method allows for the trajectory of a projectile to be reconstructed. Past studies have shown that low angle impacts are subject to error when applying the probing method. Hence, this study used the probing method to examine bullet impacts in wall sections made of drywall to determine the accuracy of the angle of incidence with respect to a known firing position. To control the angle of incidence, drywall panels were positioned at different angles beginning at 90° and decreasing until the panels were at 10°. The measured angle of incidence was compared to the known angle of incidence to determine the accuracy/error. The study observed how .40 S&W caliber ammunition from four different manufacturers, interacted with drywall panels. For each ammunition type and known angle there were three replicates, for a total of 84 impacts (n = 84). It was observed that as the angle of incidence decreased, the error of the measured value increased. Measurements from panel positions at higher angles (between 60°–90°) were more accurate and precise than measurements from panels positioned at lower angles of incidence (10°–45°). The data collected in this study provides insight into the probing method and how the accuracy of measurements can be impacted while the angle of incidence decreases. Résumé Lorsqu’un projectile entre en contact avec une surface, tel qu’un panneau de cloison sèche, il peut perforer le matériau et créer un orifice dans la surface ou encore il peut ricocher. Lorsqu’il y a plusieurs impacts de projectiles, par exemple sur une section de mur, l’emploi de tiges de trajectoire permet de reconstruire la trajectoire d’un projectile. Cependant, des études antérieures ont démontré que la mesure des impacts à angle faible est sujet à des erreurs d’exactitude lors de l’utilisation de cette méthode. Par conséquent, cette étude a utilisé des tiges de trajectoires pour analyser des impacts de projectile sur des sections de mur faites de cloisons sèches, afin de déterminer l’exactitude de l’angle d’incidence mesuré par rapport à une position de tir connue. Afin de contrôler l’angle d’incidence, des panneaux de cloison sèche ont été positionnés à différents angles, en commençant par 90° et en diminuant jusqu’à ce que les panneaux soient à 10°. L’angle d’incidence mesuré a été comparé à l’angle d’incidence connu afin de déterminer l’exactitude/erreur de cette méthode. Cette étude a permis d’observer l’interaction entre les munitions de calibre .40 S&W de quatre fabricants différents et les panneaux de cloisons sèches. Pour chaque type de munition et chaque angle connu, trois réplicas ont été effectués, pour un total de 84 impacts (n=84). Il a été observé que plus l’angle d’incidence diminuait, plus l’erreur de la valeur mesurée aug","PeriodicalId":44383,"journal":{"name":"Canadian Society of Forensic Science Journal","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41880668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Generating human STR DNA profiles from blood ingested by leeches","authors":"Elizabeth Knapp, Veronica M. Cappas, R. Roy","doi":"10.1080/00085030.2023.2177392","DOIUrl":"https://doi.org/10.1080/00085030.2023.2177392","url":null,"abstract":"","PeriodicalId":44383,"journal":{"name":"Canadian Society of Forensic Science Journal","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47089640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"“The pedagogical expert witness: teaching complex science in the courtroom”","authors":"Jonathan W. Hak","doi":"10.1080/00085030.2022.2135742","DOIUrl":"https://doi.org/10.1080/00085030.2022.2135742","url":null,"abstract":"Abstract The search for the truth can be a daunting task, but without knowing what happened and who is responsible, there can be no attempt at achieving any measure of justice. Forensic scientists often play a pivotal role in determining significant facts and interpreting those facts for the court to consider. When called to testify, expert witnesses have a special duty to the court to provide fair, objective, and non-partisan assistance. The courtroom becomes the classroom as the expert witness takes on pedagogical duties of teaching the underlying science, methodology, and the nuances of forensic opinions. Depending on the area of expertise and evidence, the learning curve for the trier of fact can be steep. The didactic presentation of complex data requires planning and skill. Drawing upon my Courtroom Testimony for Expert Witnesses course and my PhD research, I focus on the search for truth, expert witness bias, and the challenge of teaching complex science to the trier of fact. There will be specific emphasis on the incorporation of visual evidence to explain complex concepts in a more concise and memorable manner to aid in comprehension. The expert witness is a teacher and how the expert teaches makes a difference. Résumé La recherche de la vérité peut être une tâche intimidante, mais sans savoir ce qui s’est passé ou qui est responsable, il ne peut y avoir de tentative à atteindre une certaine justice. Les scientifiques judiciaires jouent souvent un rôle primordial dans la détermination des faits significatifs et dans l’interprétation de ces faits pour qu’ils soient pris en compte par le tribunal. Lorsqu’ils sont appelés à témoigner, les témoins experts ont un devoir particulier envers la cour de fournir une assistance équitable, objective et sans parti pris. La salle d’audience devient la salle de classe alors que le témoin expert assume les tâches pédagogiques en enseignant la science fondamentale, la méthodologie et les nuances des opinions judiciaires. En fonction du domaine d’expertise et des preuves, la courbe d’apprentissage pour le juge des faits peut être vertigineux. La présentation didactique de données complexes demande de la planification et des compétences. En se basant sur mon cours de trois jours intitulé “Courtroom Testimony for Expert Witnesses” et ma recherche de doctorat, je me concentrerai sur la recherche de la vérité, la partialité des témoins experts, et le défi d’enseigner de la science complexe au juge des faits. Il y aura un accent spécifique sur l’incorporation de preuves visuelles pour expliquer des concepts complexes d’une façon plus concise et mémorable pour aider à la compréhension. Le témoin expert est un enseignant et la façon dont vous enseignez fait une différence.","PeriodicalId":44383,"journal":{"name":"Canadian Society of Forensic Science Journal","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2022-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48022738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The preservation and imaging of knotted exhibits","authors":"Robert C. Chisnall","doi":"10.1080/00085030.2022.2144015","DOIUrl":"https://doi.org/10.1080/00085030.2022.2144015","url":null,"abstract":"Abstract The importance of well-preserved knots and ligatures, in conjunction with clear and unambiguous photographs and other recording techniques, is demonstrated using comparatively flawed and idealized images of mock exhibits. The identification of wends (working ends), stands (standing parts), severed ends, and unobstructed crossing points is critical. Further, determining the lengths of segments and the circumferences of loops, along with rope or cord diameters, can be of assistance during an analysis. Subtle details, such as the interrelationship of various wraps and complex entanglements, can be maintained when employing careful removal procedures. Any information that might be acquired from the knotted evidence could inform subsequent determinations and conclusions. Carefully preserved exhibits and recorded details may assist the analyser of knots and ligatures in establishing the tying sequence, the purpose of those knots, the tying habits and relative skill level displayed, and possibly the number of tiers. Case-specific issues, such as whether the knotted evidence points to homicide or suicide, may be clarified.","PeriodicalId":44383,"journal":{"name":"Canadian Society of Forensic Science Journal","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2022-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44672451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A review of human decomposition in marine environments","authors":"Britny A. Martlin, G. Anderson, L. Bell","doi":"10.1080/00085030.2022.2135741","DOIUrl":"https://doi.org/10.1080/00085030.2022.2135741","url":null,"abstract":"Abstract Drowning is the third leading cause of accidental death globally, however, many individuals who lose their lives at sea are never recovered or identified. Along with the geographic challenges posed by the underwater environment, environmental conditions influence the degradation and preservation of submerged remains. Understanding how human bodies decompose in the marine environment can assist with more accurate estimations of the postmortem submersion interval, reconstruction of the postmortem history, and determination of the original deposition environment, as well as prepare recovery teams and their families for what to expect upon locating the deceased in a marine environment. In this review, previous research surrounding human remains in the marine environment is reviewed with a focus on the factors that will influence decomposition of the human body from initial submergence to skeletonization. Experimental research, retrospective analyses, and case studies are brought together in this paper to demonstrate the currently available knowledge on marine decomposition. It is suggested that further systematic research is necessary to create robust evidentiary standards to develop context-specific knowledge on which to base future forensic investigations and assist with the recovery and identification of submerged individuals.","PeriodicalId":44383,"journal":{"name":"Canadian Society of Forensic Science Journal","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2022-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49509267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling human movement and mechanics: thoracic cage","authors":"Theodore E. Milner, G. Desmoulin","doi":"10.1080/00085030.2022.2104562","DOIUrl":"https://doi.org/10.1080/00085030.2022.2104562","url":null,"abstract":"Abstract Computer-generated models have revolutionized how reconstructions of violent events, such as police use of force, are both performed and visualized. Yet, many experts in the legal and forensic disciplines do not understand them at a level required to use them effectively or create credible arguments supporting their findings. Simply put, models are a simplification of reality. Hence, models permit human programmers to specify the simplified behavior of a system. Since model parameters dictate the system's behavior, the programmer must document and provide justification for the selection of model parameters. The model structure, together with the selected parameters, form the backbone supporting the forensic investigator’s conclusions. This paper will begin with an overview of the usefulness of models in forensic investigations and follow with an example of how a model is constructed and applied in use of force cases. The selected cases are particularly relevant to incidents commonly encountered in law enforcement, frequently leading to litigation.","PeriodicalId":44383,"journal":{"name":"Canadian Society of Forensic Science Journal","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2022-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43426762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Is the third trochanter of the femur a developmental anomaly, a functional marker, or an evolutionary adaptation?","authors":"Eren Ogut","doi":"10.1080/00085030.2022.2104563","DOIUrl":"https://doi.org/10.1080/00085030.2022.2104563","url":null,"abstract":"Abstract The third trochanter (TT) is a proximal femoral accessory tubercle at the upper border of the gluteal tuberosity that is unusually encountered on the posterior aspect. However, detailed knowledge about the TT remains limited. For this reason, TT was investigated in all its aspects. To give an overview about the TT, a review was conducted in databases until November 2021. Out of 4981 articles, only 53 articles could be included, most of which were studies conducted on dry femurs. The TT can be a result of the developmental process of gluteus maximus due to posture and bipedal locomotor activity. Another explanation of the formation of TT is the inactivation, deficiency, or mutation of specific genes that cause alterations in the proximal femoral end. The current review leads to the assumption that TT, considered for all mammalians, can be an evolutionary adaptation and may be a result of altered muscle activity, increased mechanical force, and reduced stress on the femoral shaft. Therefore, TT should be used in genomic studies related to the evolution of mammalians. An improvement in study design, the scale of the study, methodology, and the selection of mammalian species may permit more comprehensive analysis and reduce study heterogeneity. Résumé Le troisième trochanter (TT) du femur est un tubercule accessoire proximal au bord supérieur de la tubérosité fessière qui est exceptionnellement rencontré sur la face postérieure. Pour cette raison, le TT a été étudié avec tous ses characteristiques. Cependant, les connaissances détaillées sur le TT restent limitées. Pour cette raison, le TT a été étudié avec une approche exhaustive. Pour donner un aperçu sur le TT, une revue a été menée dans les bases de données jusqu’en novembre 2021. Sur 4981 articles, seuls 53 articles ont pu être inclus, dont la plupart étaient des études menées sur des fémurs secs. Le TT peut être le résultat du processus de développement du grand fessier en raison de la posture et de l’activité locomotrice bipède. Une autre explication de la formation du TT est l’inactivation, la déficience ou la mutation de gènes spécifiques qui provoquent des altérations de l’extrémité fémorale proximale. L’examen actuel conduit à l’hypothèse que le TT, considéré pour tous les mammifères, peut être une adaptation évolutive et peut être le résultat d’une activité musculaire altérée, d’une force mécanique accrue et d’un stress réduit sur la tige fémorale. Par conséquent, le TT devrait être utilisé dans les études génomiques liées à l’évolution des mammifères. Une amélioration de la conception de l’étude, de l’échelle de l’étude, de la méthodologie et de la sélection des espèces de mammifères peut permettre une analyse plus complète et réduire l’hétérogénéité de l’étude.","PeriodicalId":44383,"journal":{"name":"Canadian Society of Forensic Science Journal","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2022-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42090392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"COVID-19 and the courtroom: exploring the effects of camera angle on jury perception of expert witness credibility during virtual testimony","authors":"Elena Temelkova, Megan H. Rodrigues, Samantha Chui, Jessica Holtz, Brianna V. Legere, Caitlin Pakosh","doi":"10.1080/00085030.2022.2098610","DOIUrl":"https://doi.org/10.1080/00085030.2022.2098610","url":null,"abstract":"Abstract Since the onset of COVID-19, expert witness testimony has been delivered virtually in judge-alone trials in Ontario with increasing frequency. It is unknown how controllable technological factors in the virtual environment – such as camera angle – may influence jury perception of expert witness credibility. This study assesses whether camera angle has a significant effect on juror perception of expert witness credibility. Jury-eligible participants from Ontario (n = 72) acted as mock jurors in four mock drug trafficking trials involving the same virtual forensic toxicology testimony. The control group (n = 34) watched an expert who was shown from the mid-chest up, whereas the experimental group (n = 38) watched an expert who had their camera angle set to show only their head. Using the Witness Credibility Scale (WCS), participants assessed expert credibility by completing 20 Likert-scale questions related to the expert’s knowledge, likeability, trustworthiness, and confidence. A Mann-Whitney U test indicated no significant difference between the control and experimental groups (p = 0.66, p > 0.05). Therefore, camera angle has no significant impact on juror perception of expert witness credibility, suggesting that experts can use either angle when testifying virtually. This research may help to inform future best practices for virtual expert testimony, enhancing quality and standardization.","PeriodicalId":44383,"journal":{"name":"Canadian Society of Forensic Science Journal","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2022-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49018986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Accuracy of Iranian Cameriere and Willems methods for estimating dental age in a population of Iranian children","authors":"E. Salehi, E. Afshari, M. Fazel, Azizeh Karimian, Maysa Mallahi","doi":"10.1080/00085030.2022.2084927","DOIUrl":"https://doi.org/10.1080/00085030.2022.2084927","url":null,"abstract":"Abstract Age estimation methods based on dental radiographs are of the most accurate and popular methods for age estimation. The accuracy of these methods might vary between different ethnic groups. Therefore, the present study was performed in order to evaluate and update the Cameriere dental age estimation method in a population of Iranian children and compare it with the Willems dental age estimation method. A retrospective cross-sectional study was performed, using dental records and digital dental panoramic radiographs of 110 six- to 12-year-old patients (55 girls and 55 boys). In order to assess the accuracy of both methods, the difference between the estimated dental age and the Chronological age was calculated and compared. Results of the present study showed Willems method overestimated the age and the updated Iranian Cameriere method underestimated the age, but the over/underestimations were not significant, except for the boys in Willems group. Both Willems dental age estimation (WDA) and Iranian Cameriere dental age estimation (ICDA) methods were applicable in the selected population of Iranian children, although the WDA estimations were less accurate, especially for boys.","PeriodicalId":44383,"journal":{"name":"Canadian Society of Forensic Science Journal","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2022-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41551255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}