Forensic Practitioner S Guide To The Interpretation Of Complex Dna Profiles
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Forensic Practitioner's Guide to the Interpretation of Complex DNA Profiles
Over the past twenty years, there's been a gradual shift in the way forensic scientists approach the evaluation of DNA profiling evidence that is taken to court. Many laboratories are now adopting 'probabilistic genotyping' to interpret complex DNA mixtures. However, current practice is very diverse, where a whole range of technologies are used to interpret DNA profiles and the software approaches advocated are commonly used throughout the world. Forensic Practitioner's Guide to the Interpretation of Complex DNA Profiles places the main concepts of DNA profiling into context and fills a niche that is unoccupied in current literature. The book begins with an introduction to basic forensic genetics, covering a brief historical description of the development and harmonization of STR markers and national DNA databases. The laws of statistics are described, along with the likelihood ratio based on Hardy-Weinberg equilibrium and alternative models considering sub-structuring and relatedness. The historical development of low template mixture analysis, theory and practice, is also described, so the reader has a full understanding of rationale and progression. Evaluation of evidence and statement writing is described in detail, along with common pitfalls and their avoidance. The authors have been at the forefront of the revolution, having made substantial contributions to theory and practice over the past two decades. All methods described are open-source and freely available, supported by sets of test-data and links to web-sites with further information. This book is written primarily for the biologist with little or no statistical training. However, sufficient information will also be provided for the experienced statistician. Consequently, the book appeals to a diverse audience - Covers short tandem repeat (STR) analysis, including database searching and massive parallel sequencing (both STRs and SNPs) - Encourages dissemination and understanding of probabilistic genotyping by including practical examples of varying complexity - Written by authors intimately involved with software development, training at international workshops and reporting cases worldwide using the methods described in this book
Techniques of Crime Scene Investigation
"Techniques of Crime Scene Investigation is a staple for any forensic science library and is routinely referenced by professional organizations as a study guide for certifications. It is professionally written and provides updated theoretical and practical applications using real casework. This text is a must-have for any CSI Unit or course teaching Crime Scene Investigation." – Kevin Parmelee, PhD, Detective (ret.), Somerset County, NJ Prosecutor’s Office Since the first English-language edition of Techniques of Crime Scene Investigation was published in 1964, the book has continued to be a seminal work in the field of forensic science, serving as a foundational textbook and reference title for professionals. This Ninth Edition includes several new chapters and has been fully updated and organized to present the effective use of science and technology in support of justice. New coverage to this edition addresses the debunking of a few forensic science disciplines, long thought to have been based on sound science. The book provides students, crime scene investigators, forensic scientists, and attorneys the proper ways to examine crime scenes and collect a wide variety of physical evidence that may be encountered. While it is not possible to cover every imaginable situation, this book is a comprehensive guide that details and promotes best practices and recommendations. In today’s challenging environment, it is essential that law enforcement personnel thoroughly understand and meticulously comply with the forensic evidence procedures that apply to their function in the investigation process. Criminal investigations remain as complex as ever and require professionals from many disciplines to work cooperatively toward the fair and impartial delivery of justice. Practitioners and students alike need to be aware of the increased scrutiny that they will face in the judicial system. Judges are taking a more involved role than ever before as far as the evidence and testimony that they allow into their courtrooms. No longer will substandard forensic science or crime scene investigation be acceptable. Key features: Newly reorganized contents—including 4 brand new chapters—reflects a more logical flow of crime scene processes and procedures Provides an overview of the crime scene investigation process and procedures, from the first officer on the scene through the adjudication of the case Includes several new cases, photos, and updates in technological advances in both digital evidence and DNA in particular Science and technology applied to CSI solves crimes and saves lives. Investigators, prosecutors, and defense attorneys must be able to use forensic tools and resources to their fullest potential and Techniques of Crime Scene Investigation serves as an invaluable resource to further this cause.
Interpreting Complex Forensic DNA Evidence
Interpreting Complex Forensic DNA Evidence is a handy guide to recent advances—and emerging issues—in interpreting complex DNA evidence and profiles for use in criminal investigations. In certain cases, DNA cannot be connected to a specific biological material such as blood, semen or saliva. How or when the DNA was deposited may be an issue. The possibility of generating DNA profiles from touched objects, where there may not be a visible deposit, has expanded the scope and number of exhibits submitted for DNA analysis. With such advances, and increasing improvements in technological capabilities in testing samples, this means it is possible to detect ever smaller amounts of DNA. There are also many efforts underway to seek was to interpret DNA profiles that are sub-optimal—either relative to the amount required by the testing kit and, potentially, the quality of the obtained sample. Laboratories often use enhancements in order to obtain a readable DNA profile. The broad-reaching implications of improving DNA sensitivity have led to this next, emerging generation of more complex profiles. Examples partial profiles that do not faithfully reflect the proposed donor, or mixtures of partial DNA from multiple people. A complexity threshold has been proposed to limit interpretation of poor-quality data. Research is now addressing the interpretation of transfer of trace amounts of DNA. Complex issues are arising in trial that need to be reconciled as such complexity has added challenges to the interpretation of evidence and its introduction or dismissal in certain cases in the courts. Key Features: Addresses DNA transfer, from person-to-person as well as to objects Outlines each stage required to produce a DNA profile from an exhibit—including collection, handling, storage, and analysis Discusses ethics, subjectivity, and bias—including cognitive dissonance—as they relate specifically to complex DNA evidence Highlights current techniques and the latest advances in DNA analysis, including advances in familial DNA searches Interpreting Complex Forensic DNA Evidence provides tools to assist the criminal investigator, forensic expert, and legal professional when posed with a DNA result in a forensic report or testimony. The result—and any associated statistic—may not reveal any ambiguity, complexity, or the assumptions involved in deriving it. Questions from resolved criminal cases are posed, and the relevant forensic literature, provided for the reader to assess a DNA result and any associated statistic. Case studies throughout illustrate concepts and emphasize the need for conclusions in the forensic report that are supported by the data.