Mechanics Of Impression Evidence

Presenting the hard science increasingly required by courts to back up expert opinion in cases that hinge on impression evidence comparison, this book applies the methods of physics, chemistry, and engineering to analysis and interpretation of fingerprints, footwear and tire tread impressions, and bloodstains. Using easily accessible language, it shows the scientific method behind each of these discrete disciplines. It then combines and cross-references the knowledge within each to ultimately present a more generalist approach and thus a more informed judgment.

This workbook is a very practical, hands-on learning tool for forensic science disciplines in bullet and tool mark examination, serial number restoration, shooting reconstruction, latent fingerprint processing and analysis, and document analysis. This workbook contributes greatly to forensic science students; all of whom need basic understanding and experience in impression evidence.

Reviewed and recognized as the most authoritative source in the field, this book describes the methods used worldwide to recover and identify footwear impressions from the scene of a crime. In this new edition, everything, including the original twelve chapters, bibliography, appendix, etc., has been clarified, updated and expanded. This edition includes updated and new information on recovery procedures and materials such as lifting, photography and casting; chemical enhancement; updated information about footwear manufacturing; footwear sizing; and known impression techniques and materials. WHAT’S NEW IN THE SECOND EDITION: Besides updating and expanding the twelve original chapters, Footwear Impression Evidence: Detection, Recovery and Examination, Second Edition adds three new chapters: one chapter on barefoot evidence, which concerns impressions made by the naked or sock-clad foot or those which remain in abandoned or discarded footwear; another new chapter on several cases in which the footwear impression evidence was of primary importance in bringing about a conviction or confession; and finally, a new chapter on the footwear impression evidence in the O.J. Simpson criminal and civil cases.

Reviewed and recognized as the most authoritative source in the field, this book describes the methods used worldwide to recover and identify footwear impressions from the scene of a crime. In this new edition, everything, including the original twelve chapters, bibliography, appendix, etc., has been clarified, updated and expanded. This edition includes updated and new information on recovery procedures and materials such as lifting, photography and casting; chemical enhancement; updated information about footwear manufacturing; footwear sizing; and known impression techniques and materials. WHAT’S NEW IN THE SECOND EDITION: Besides updating and expanding the twelve original chapters, Footwear Impression Evidence: Detection, Recovery and Examination, Second Edition adds three new chapters: one chapter on barefoot evidence, which concerns impressions made by the naked or sock-clad foot or those which remain in abandoned or discarded footwear; another new chapter on several cases in which the footwear impression evidence was of primary importance in bringing about a conviction or confession; and finally, a new chapter on the footwear impression evidence in the O.J. Simpson criminal and civil cases.

The digital revolution over the past several decades has advanced every facet of evidence detection, photography, optimization, and interpretation. Forensic scientists and practitioners have benefited tremendously from the move from film to digital. With proper procedures in place, digital images and casework capabilities have increased tremendously in both complexity and range due to a vast array of tools to enhance evidence and photography. Forensic Digital Image Processing: Optimization of Impression Evidence provides the forensic investigator with the tools and understanding to extract, optimize, and interpret the maximum evidence possible from crime scenes to increase identifications. The book begins by examining the emergence of forensic digital image processing, and the gradual improvement and acceptance of the science over the past four decades. Coverage includes looking at the issues of image integrity and authentication including forensic image optimization and the manipulation of images. Chapters explore techniques exploiting color theory, modes, and channels to optimize signal-to-noise ratio in images. One of the greatest assets of digital image technology is the ability to combine multiple images of the same subject to create a final, blended image: one that displays the desired evidence and is especially useful for fingerprint or footwear impression. Later chapters demonstrate image subtraction, focus stacking, and high dynamic range, utilizing images in optimum focus and with substrate interference diminished or removed entirely. The authors look at fast Fourier transform as an optimal tool for noise removal, addressing basic theory and diagnosis of the noise signatures. The book discusses the history of digital imaging techniques and their treatment within the court system. Forensic Digital Image Processing: Optimization of Impression Evidence serves as an invaluable resource and tool for practicing professionals–as well as those new to the field—to look at best practices, the latest technology, and advances in utilizing the increasing array of tools of the trade.

Forensic Evidence Field Guide: A Collection of Best Practices highlights the essentials needed to collect evidence at a crime scene. The unique spiral bound design is perfect for use in the day-to-day tasks involved in collecting evidence in the field. The book covers a wide range of evidence collection and management, including characteristics of different types of crime scenes (arson, burglary, homicide, hit-and-run, forensic IT, sexual assault), how to recover the relevant evidence at the scene, and best practices for the search, gathering, and storing of evidence. It examines in detail the properties of biological/DNA evidence, bullet casings and gunshot residue, explosive and fire debris, fibers and hair, fingerprint, footprint, and tire impression evidence, and much more. This guide is a vital companion for forensic science technicians, crime scene investigators, evidence response teams, and police officers. Unique Pocket Guide design for field work Best practice for first evidence responders Highlights the essentials needed to collect evidence at a crime scene Focus on evidence handling from documentation to packaging

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This is a guide to recommended practices for crime scene investigation. The guide is presented in five major sections, with sub-sections as noted: (1) Arriving at the Scene: Initial Response/Prioritization of Efforts (receipt of information, safety procedures, emergency care, secure and control persons at the scene, boundaries, turn over control of the scene and brief investigator/s in charge, document actions and observations); (2) Preliminary Documentation and Evaluation of the Scene (scene assessment, "walk-through" and initial documentation); (3) Processing the Scene (team composition, contamination control, documentation and prioritize, collect, preserve, inventory, package, transport, and submit evidence); (4) Completing and Recording the Crime Scene Investigation (establish debriefing team, perform final survey, document the scene); and (5) Crime Scene Equipment (initial responding officers, investigator/evidence technician, evidence collection kits).