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Gunshot residue examination is a specialized discipline of forensic science. Techniques for examining GSR have evolved from simple color tests to modern analytical methods. This book details current methods of GSR analysis for professionals who utilize this type of evidence in their work and introduces the subject to laypeople interested in learning about this everchanging field. The concept of this text was formulated with current methods of GSR in mind. A comprehensive text on the examination of GSR was compiled more than 20 years ago in a publication called the Aerospace Report No. ATR-77-3. To date, the Aerospace Report is the most comprehensive text available about GSR. Since that time, advancements have been made in the way GSR evidence is examined in laboratories worldwide, and many laboratories have modified the classification of certain particles derived from this type of evidence. This book is not meant to replace the extensive research compiled by the Aerospace Report, but rather to supplement that report and many other quality research papers that have been published over the past 20 years. This text concentrates on certain areas that we consider most important to examiners in the law enforcement community and students of criminal justice and forensics. Chapter 1 discusses the significance of GSR evidence, collection criteria, and general topics. Chapter 2 examines particle formation and presents a current classification scheme for GSR evidence. The classification of particles is an important aspect of GSR evidence that is evolving as research in this area continues. A general overview of scanning electron microscopy energy dispersive spectroscopy is presented in some detail in. This chapter will educate both bench examiners and students about this powerful method of analysis, now at the forefront of GSR examination. General theory, computer-controlled scanning electron microscopy, and variable pressure scanning electron microscopy are discussed