Following a review of the history of policing in Great Britain and the United States, police personality, attitudes, and values are discussed as they affect performance. Case law and practice then are examined in seven major areas: Stop and frisk procedures in terms of the 'reasonable suspicion' standard; police authority to arrest; law and practice relating to searches and warrants, with a focus on the exclusionary rule and the good faith exception; exceptions to warrant requirements; the use of deadly force; interrogations and confessions in terms of the fifth amendment; and the effect of the Miranda warning. Forms and causes of police corruption are discussed. The role of women in policing and their performance also is considered. Finally, areas of police performance that have improved and those still requiring improvement are assessed. Index, chapter tables, and references.