The interpretation and evaluation of scientific evidence and its presentation in a court of law is central both to the role of the forensic scientist as an expert witness and to the interests of justice. This book aims to provide a thorough and detailed discussion of the principles and practice of evidence interpretation and evaluation by using real cases by way of illustration. The presentation is appropriate for students of forensic science or related disciplines at advanced undergraduate and master’s level or for practitioners engaged in continuing professional development activity.
The book is structured in three sections. The first sets the scene by describing and debating the issues around the admissibility and reliability of scientific evidence presented to the court. In the second section, the principles underpinning interpretation and evaluation are explained, including discussion of those formal statistical methods founded on Bayesian inference. The following chapters present perspectives on the evaluation and presentation of evidence in the context of a single type or class of scientific evidence, from DNA to the analysis of documents. For each, the science underpinning the analysis and interpretation of the forensic materials is explained, followed by the presentation of cases which illustrate the variety of approaches that have been taken in providing expert scientific opinion.
Chapter 1: An Introduction to the Admissibility of Expert Scientific Opinion
Chapter 2: Admissibility from the Legal Perspective
Chapter 3: Forensic Science and the Law: the Path Forward
Chapter 4: Scientific Opinion and the Law in Practice
Chapter 5: Fundamentals of the Interpretation and Evaluation of Scientific Evidence
Chapter 6: Case Studies in Expert Opinion
Chapter 7: Formal Methods for Logical Evaluation
Chapter 8: Case Studies in Probabilistic Opinion
Chapter 9: Cognitive Bias and Expert Opinion
Chapter 10: The Evaluation of DNA Profile Evidence
Chapter 11: Low Template DNA
Chapter 12: Footwear Marks in Court
Chapter 13: Fingerprints and Fingermarks - Identifying Individuals?
Chapter 14: Trace Evidence, Databases and Evaluation
Chapter 15: Firearm and Tool-mark Evidence
Chapter 16: Expert Opinion and Evidence of Human Identity
Chapter 17: Questioned Documents
Chapter 18: Bloodstain Pattern Analysis
Chapter 19: Conflicting Expert Opinion: SIDS and the Medical Expert Witness
Appendix: Some Legal Terminology