This new second edition, many years in the making, provides the reader with the information that is needed to understand both traditional mechanisms as well as the most modern and sophisticated security technology incorporated into locks and how to bypass them. The author presents extremely detailed theoretical and practical information in order to facilitate a thorough understanding of the complex subject matter. While the first edition covered many topics in summary fashion, this revised work examines each facet of the subject in extensive and, when required, intricate detail. Law enforcement, forensic examiners, the intelligence community, security management personnel, locksmiths, architects, security specialists, special operations personnel, lawyers, and others need to have this critical information presented in this book in order to deal effectively with their missions and be able to assess vulnerability through a solid theoretical understanding of the subjects covered. Information in this book has been gathered from many sources, including locksmiths, manufacturers, instructors from recognized specialized entry schools, vendors, lock suppliers, designers, engineers, inventors, forensic examiners, and others. The subject of this book is very complicated, diverse, and global. There is a great deal of history and technology incorporated within the modern lock, container, and security system. The focus of this text is to put all of this information into an understandable and useable format.