Crime scene reconstruction: a scoping review

With the beginning of the criminal procedure, in its first part of the preliminary procedure stage (pre-investigative and investigative), legally relevant facts are determined through evidentiary means, by which we mean sources from which the evidence bases are obtained. The crime scene investigation and reconstruction are integral parts of the evidentiary actions system that are applied within the frame- work of criminal and criminal proceedings with the aim of efficient and effective research, elucidation, and proof of the criminal event. The crime scene investigation is a systematic action by which, by the provisions of the law, objects, traces, and other circumstances important for clarifying the criminal legal event are taken, expertly processed, and in the crime scene investigation documentation registered, and fixed. Crime scene reconstruction is determining or eliminating the events and actions that occurred at the crime scene through analysis of the crime scene pattern, the location and position of the physical evidence, and the laboratory examination of the physical evidence. Reconstruction involves the systematic study of related infor- mation and the logical formulation of a theory.

Bloodstain Pattern Analysis (BPA) stands as a precious tool in the crime scene investigation and reconstruction, providing invaluable insights into the circumstances surrounding bloodshed. This comprehensive review delves into the profound significance of BPA, charting its evolution over time while spotlighting recent breakthroughs and identifying potential areas for further research and development, especially within the domain of digital technology. The fundamental essence of BPA lies in meticulously analyzing the form and dispersion patterns of bloodstains found at crime scenes., which aids investigators in comprehending the deposition of blood on evidence and shedding light on the movements and positions of the individuals and objects involved during the incident. Notably, BPA facilitates differentiating between accidents, homicides, and suicides, as well as identifying bloodstains left by criminals, thus playing a crucial role in ascertaining the circumstances surrounding an incident. Elements like blood velocity and the nature of the impacted surface significantly influence the size and shape of bloodstains, imparting crucial clues for an accurate crime scene reconstruction.A noteworthy application of BPA is in impact spatter analysis on hands, which holds importance for forensic ballistic examiner to recognize the firearm. Studies are discussed, related to sophisticated image processing and computerized techniques for BPA to scrutinize their reliability and accuracy. Cutting-edge advances have been witnessed in the field, including the application of Raman spectroscopy, automated methodologies, and the utilization of software programs like the FARO Scene program. These advancements have substantially elevated the efficacy and capabilities of BPA, empowering forensic investigators with enhanced analytical tools. Despite the remarkable strides made in blood spatter pattern analysis, the review underscores the abundant potential for continued research and development. In particular, refinements in methods for dating dried blood pattern and the evolution of automated techniques for crime scene reconstruction are prime avenues worthy of exploration.

Crime Scene Investigation and Reconstruction: An Illustrated Manual and Field Guide provides methodologies to help investigators to think broadly when seeking out evidence at a scene and, likewise, utilize all the information from a case—especially the observable physical evidence, besides what are collectable, in reconstructing events. In the introductory chapters the author highlights the importance of crime scene reconstruction when answering the question “How something could have happened?” From there, he goes on to explain the principles of exchange, identification, individualization and reconstruction. Here, the “observe-hypothesize” model, proposed in this field-guide, is presented: outlining how every source of information ranging from laboratory reports, opinions from medical doctors, statements of witnesses, and confessions of suspects should be reconcilable with the evidence-based reconstruction made in the crime scene. In this, the author contends that qualified crime scene generalists are the ideal professionals to frame scientific hypothesis and to make reconstructions. Practical recommendations, based on best-practice general crime scene procedures are provided while the second half of the book illustrate and outline how to deal with various types of major crime scenes, including fire deaths, exhuming buried human remains, sexual assaults, death by electrocution, explosion, drowning, poisoning, hanging, and more. Since a picture is a worth thousand words, over 400 collective photographs and sketches are included throughout the book to illustrate the observational methods that are described. In addition, the field-guide provides several easy-to-follow flow-charts to serve as checklists to aid scene investigation in major types of crime scene. In this, Crime Scene Investigation and Reconstruction: An Illustrated Manual and Field Guide will help investigators readily recognize similar manifestations in crime scenes and to apply and use such techniques appropriately in their own work.

This paper explores the applications of Augmented Reality (AR) and Virtual Reality (VR) technologies in forensic science, specifically in crime scene investigation and the judiciary system. AR and VR offer immersive and interactive experiences that aid in crime scene reconstruction, evidence collection, and visualization. These technologies have the potential to transform courtroom proceedings by enabling virtual courtrooms, enhancing evidence presentation, and facilitating virtual crime scene reconstructions. AR and VR also have implications in legal research, judicial training, and access to justice. The importance of crime scene investigation and reconstruction in forensic science is highlighted, emphasizing their role in evidence preservation, identification, and the determination of cause and manner of death. The intricacies of conventional crime scene reconstruction, such as evidence collection, interpretation, and reconstruction limitations, are discussed. AR and VR technology can overcome these challenges by providing virtual crime scene tours, training simulations, and interactive courtroom presentations. Overall, AR and VR have the potential to enhance forensic science practices and the judiciary system, offering new tools and capabilities for investigators, legal professionals, and the public.

When it is determined that there are or should be traces of blood at the crime scene, it is necessary to take search measures of the crime scene and visualize such traces. The next important step is documenting these clues by description, criminal photography, sketching and video made to make them available for potential additional analysis in the later stages of criminal investigation or criminal procedure. Traces of blood are found in many criminal offenses and can be important evidence. It would be a crucial mean, when combined with the information derived from any DNA analysis, to allow an investigator to corroborate or refute specific investigative theories and subsequent statements offered by suspects, victims, and witnesses. So, the current study aim to clarify the crime scene investigation and reconstruction for detecting bloodstain patterns; specific skills of criminalist for analyzing blood traces; different means for interpreting such traces; blood factor and types as important tools in criminal investigation for blood patterns. Keywords: Blood; Crime Scene; Trace

An Introduction and History of Crime Scene Analysis Distinguishing Crime Scene Analysis from Crime Scene Processing Pioneers in Crime Scene Analysis: A History of the Discipline The Future Theoretical and Practical Considerations for Implementing Crime Scene Analysis Who Qualifies as a Crime Scene Analyst? Fundamental Beliefs for Crime Scene Analysis When Is Crime Scene Analysis Employed? Event Analysis: A Practical Methodology for Crime Scene Reconstruction The Event Analysis Process Resolving Significant Investigative Questions in CSR Using the Event Analysis Worksheet Event Analysis Worksheet Explained Statement Analysis Using the Worksheets Understanding Crime Scene Protocols and Their Effect on Reconstruction The Importance of the Crime Scene Investigator Role of the Initial Responding Officer Incorporating the Basic Crime Scene Activities into a Crime Scene Protocol Applying Bloodstain Pattern Analysis to Crime Scene Reconstruction A Background of Bloodstain Pattern Analysis Impact Angle and Directionality Bloodstain Classification Area of Origin Evaluations Shooting Scene Processing and Reconstruction Mathew Noedel Understanding Ammunition Understanding Firearms Reconstruction Potential Associated with Firearms Accidental versus Unintentional Discharge Handling Firearms at a Scene Recording Impacts and Ricochets Gunshot Residue Examination Processing Shooting Scenes The Forensic Pathologist, the Body, and Crime Scene Reconstruction Scott A Wagner, MD Theory and Approach to Death Scene Investigation The Body and the Death Scene Writing Crime Scene Reconstruction Reports Essential Report Elements Arguments and Ethics Deductive and Inductive Arguments The Role of Logic in Crime Scene Analysis An Ethical Approach to Crime Scene Analysis Developing and Using Demonstrative Exhibits in Support of the Crime Scene Analysis Iris Dalley Collection of Data Analysis of Data Index

Bloodstain Analysis: Its Function and a Historical Perspective. Crime Scene Analysis and Reconstruction. Terminology. Understanding the Medium of Blood. Determining Motion and Directionality. Determining Point of Convergence and Point of Origin. Evaluating Impact Spatter Bloodstains. Characteristic Patterns of Blood Which Aid in Analysis. Documenting Bloodstains. Documenting the Reconstruction of a Crime. Automation Applications in Bloodstain Pattern Analysis and Crime Scene Reconstruction. Presenting Evidence at Trial. Dealing with Bloodborne Pathogens. Bibliography. Appendices.

Violent crimes are often pigeon-holed by bloodstain found at the crime scene. The science of analysing the bloodstains found at the crime scene is referred to as bloodstain pattern analysis (BPA). The bloodstain pattern analysis embraces analysts recognising and interpreting bloodstain patterns to uncover how they were bent, when they were created, who created them and what object was used. Bloodstain pattern analysis is an important technique for determining what happened at the crime scene and presenting answers to the crime that occurred. Bloodstain pattern analysis is a subfield of forensic science that utilises blood evidence to dive a conclusion about a crime and to illustrate the shadows of violent crimes. Though violent crime scenes that involve bloodshed often provide a prosperity of data in the form of the patterns, location, and possible causes of the bloodshed, it is unfortunate that such critical information can be missed and/or evidence demolished due to futile ways of protecting and preserving bloodstain patterns at the crime scene by the crime scene investigators from the Local Criminal Record Centre. The article took qualitative empirical approach where participants were interviewed with the permission obtain from South African police Services and ethical clearance acquired from the University of South Africa. Findings and recommendations in this article were significant for implementation by the police.

Graphic Data Systems Corporation (GDS Corp.) and Intellignet Graphics Solutions, Inc. (IGS) combined talents in 1995 to design and develop a MicroGDS<SUP>TM</SUP> application to support field investiations of crime scenes, such as homoicides, bombings, and arsons. IGS and GDS Corp. prepared design documents under the guidance of federal, state, and local crime scene reconstruction experts and with information from the FBI's evidence response team field book. The application was then developed to encompass the key components of crime scene investigaton: staff assigned to the incident, tasks occuring at the scene, visits to the scene location, photogrpahs taken of the crime scene, related documents, involved persons, catalogued evidence, and two- or three- dimensional crime scene reconstruction. Crime scene investigation, reporting, and reconstruction (CSIRR$CPY) provides investigators with a single applicaiton for both capturing all tabular data about the crime scene and quickly renderng a sketch of the scene. Tabular data is captured through ituitive database forms, while MicroGDS<SUP>TM</SUP> has been modified to readily allow non-CAD users to sketch the scene.

We explore for the first time the effect of medical drugs on Bloodstain Pattern Analysis (BPA). The widely administrated anticoagulant warfarin is examined with its effect on blood viscosity measured using a capillary tube viscometer over the range of 10−6 M to 10−4 M, representing therapeutic to fatal levels respectively. We find that the administration of therapeutic to fatal doses corresponds to a viscosity change of 3.6 to 20.4% respectively. Additionally the effect of warfarin on blood's surface tension, usually assumed to be constant, is examined over the therapeutic and fatal dosage range, which was found to result in a change of between 0.6 and 4.7% respectively. The observed variability's were integrated into previously derived BPA equations used for de-convoluting various parameters where convincing evidence is shown that drug contaminated blood induces a variation of 1.23 mm (5.93%) in the determined final stain diameter leading therefore to the possible misinterpretation of bloodstains found at Crime Scenes and consequently inaccuracies to occur in crime scene reconstruction. This work offers insight into whether medical drugs play a significant role in the possible misinterpretation of bloodstain evidence.

In the last two decades, forensic pathology and crime scene investigations have seen a rapid increase in examination tools due to the implementation of several imaging techniques, e.g., CT and MR scanning, surface scanning and photogrammetry. These tools encompass relatively simple visualization tools to powerful instruments for performing virtual 3D crime scene reconstructions. A multi-modality and multiscale approach to a crime scene, where 3D models of victims and the crime scene are combined, offers several advantages. A permanent documentation of all evidence in a single 3D environment can be used during the investigation phases (e.g., for testing hypotheses) or during the court procedures (e.g., to visualize the scene and the victim in a more intuitive manner). Advanced computational approaches to understand what might have happened during a crime can also be applied by, e.g., performing a virtual animation of the victim in the actual context, which can provide important information about possible dynamics during the event. Here, we present an overview of the different techniques and modalities used in forensic pathology in conjunction with crime scene investigations. Based on our experiences, the advantages and challenges of an image-based multi-modality approach will be discussed, including how their use may introduce new visualization modalities in court, e.g., virtual reality (VR) and 3D printing. Finally, considerations about future directions in research will be mentioned.

As a result of its viscous nature, blood stain patterns formed from blood splatter makes blood one of the most common pieces of evidence encountered. Bloodstain pattern analysis (BPA) is a branch of forensic science that examines the physical properties of blood and uses graphical pattern recognition to map out and evaluate bloodstains found at crime scenes and crime scene reconstruction. Crime scene reconstruction ensures a better understanding of events that unfolded at a scene. However, health and ethical issues in using real blood during reconstruction have led scientist to search for alternatives to mimic blood. An investigation using henna dye to mimic bloodstain by dropping from different heights (3 to 7 feet) was carried out in an outdoor crime scene simulation area. With the necessary steps involved in post scene processes diligently followed, it was observed that at 3 the formation of insignificant satellites with small spines around each drop, at 4 feet minimal satellite stains and longer spines appeared, at 5 feet very small spines and minimal satellites were observed with an elongation on parent droplet, at 6 feet shows more distant longer satellites and at 7 feet tiny elongated droplets observed with satellites and had smaller droplet attached. It was concluded that when the height of dropping fake blood is increased, the distance of satellite stains emerging from the fake bloodstain also increases. Therefore the bloodstain pattern formed is dependent on the height of the blood spatter on a horizontal surface. Therefore henna could be used to for investigations of crime scenes and educational studies on bloodstain pattern analysis (BPA).

In order to properly reconstruct and analyze a crime scene it is important for a forensic professional to have a keen eye for trace evidences. Trace evidences are intricate amounts of physical, chemical or biological evidences found at a crime scene that require proper handling and analysis to produce a near accurate representation of the events that could have occurred at a crime scene. At a crime scene, sensor-based devices come in handy in analyzing trace evidences. There are several advantages to the use of sensors in the field of forensics. Sensor based analyses of evidences are generally rapid, cost-efficient, precise and possess higher limits of detection, hence their applications become diverse in the field of forensic science and crime scene investigations. This chapter deals with the different type of trace evidences found at a crime scene and the diverse applications of sensors in their detection and quantification. Additionally, a critical emphasis has also been given on the different mechanisms through which the sensor-based devices interact with the samples that needs to be assessed.

With the wide application of 3D face reconstruction technology in the fields of face recognition, security early warning, and target tracking in recent years, the research of 3D face reconstruction methods has become a hot spot in the field of computer vision. Although the 3D reconstruction technology has certain theoretical support and wide application basis, how to ensure the authenticity and accuracy in the process of restoring the face is still a difficult research point for a long time. This paper focuses on the 3D face reconstruction technology, mainly focusing on the 3D face reconstruction algorithm based on the single face image as input, and conducts related research. They mainly include model-based 3D reconstruction and end-to-end reconstruction algorithms. Compared with the traditional face reconstruction algorithm based on multiple images, the use of single 2D image for 3D reconstruction has more prominent advantages in terms of economy and time cost. It makes mobile 3D face offline reconstruction possible. It will bring more real and objective application prospects to the future public safety guarantee, and make the construction of smart cities possible.

To explore the application of three-dimensional (3D) reconstruction technology for midline glossectomy in patients with obstructive sleep apnea (OSA). Fifteen patients with OSA were included in this study. Each of them received computed tomography angiography (CTA) examination of lingual arteries in the resting tongue position and fully extended tongue position respectively. The two-dimensional CTA images were converted to 3D models using 3D reconstruction technology. We simulated the midline glossectomy in different tongue positions with a safe margin of 3mm. The differences in the distances between bilateral lingual arteries, the depths of the lingual arteries and the surgical resectable volumes of the tongue were compared between different tongue positions in 3D models. The depths of the lingual arteries, the distances between bilateral lingual arteries based on three measuring sections and the surgical resectable volumes of the tongue in the fully extended tongue position were significantly smaller than those in the resting tongue position (P < 0.01 or 0.05). The 3D reconstruction technology can show the course of lingual artery stereoscopically and visually, and can be more beneficial to guide surgery than two-dimensional examination. Lingual artery examination in the fully extended tongue position has higher specificity in displaying intraoperative actual situation.