Electromechanical alarm devices, volumetric intrusion detection systems, locks, access controls, and polygraphs are some of the equipment commonly found within the security industry. The text illustrates their functions and technical operating characteristics/specifications for the security students and practitioners and describes guard and investigative businesses, central alarm stations, armored car and courier services, etc. Opportunities, background requirements, and salary levels for security officers in these industries are also mentioned, as are legal constraints affecting individuals in the security business and some of the standards regulating the industry. The author also explains how physical security surveys and other security measures (i.e., alarm systems) are designed and how effective they can be in different environments. Many chapters include reference notes, glossaries, tabular data, and diagrams. A directory of security and security-related organizations and an index are appended.