The author conducted a survey of police practices relating to pretrial identification procedures in 6 Ontario cities and l3 police departments across Canada before preparing the guidelines. An introduction discusses the need to structure the exercise of police discretion and the dangers inherent in eyewitness testimony. It reviews actual cases in which wrongful convictions have resulted from mistaken eyewitness identification, psychological studies documenting the frailty of human perception and memory, and reasons why eyewitness testimony is so difficult to assess. The book sets out the guidelines and then comments individually on each. The commentary explains reasons for the rule, reviews Commonwealth cases on related issues, and briefly describes present Canadian practice. Part I of the guidelines defines their scope, with attention to procedures, restrictions on eyewitness identification, and circumstances where the guidelines may be unnecessary or modified. Part II concerns general rules, such as separating witnesses, instructing witnesses, recordkeeping, and right to counsel. The remaining sections address obtaining descriptions, use of sketches and composites, lineups, showing photographs, informal identification procedures, and confrontations. The author concludes that a lineup is a better identification test than a photographic display. Footnotes, approximately 320 references, and a table of cases are supplied.