"Body scanners are used to screen for contraband in a variety of places. Airports, schools, government buildings, and corrections facilities are examples of the types of places that have employed body scanners. Different types of body scanners have different capabilities based on the imaging technologies used and the sophistication of the internal system analysis. Metal detection was one of the first technologies developed to identify metallic objects on a person, but contraband can take many other forms, such as powders (e.g., drugs), paper (e.g., money), and even ceramic or plastic weapons. Correctional facilities in particular are faced with various forms of contraband, and with elaborate methods of evading detection employed by the local population. Manufacturers have responded by producing scanners that are able to detect nonmetallic contraband, as well as systems that can detect contraband inside body cavities. This report identifies commercially available body scanners and discusses the technologies used by these products. Technological limitations pertaining to the type of materials detected and/or the ability to detect contraband inside body cavities are discussed."