The Handbook of Police Psychology represents the contributions of over thirty police psychologists, all experts in their field, on the core subject matters of police psychology. Police psychology is broadly defined as the application of psychological principles and methods to law enforcement. This growing area includes topics such as screening and hiring of police officers; conducting screening for special squads (e.g., SWAT); fitness-for-duty evaluations; investigations, hostage negotiations; training and consultation, and stress counseling, among others. The book examines the beginnings of police psychology and early influences on the profession such as experimental investigations of psychological testing on police attitude and performance. Influential figures in the field of police psychology are discussed, including the nation’s first full-time police psychologist who served on the Los Angeles Police Department, and the first full-time police officer to earn a doctorate in psychology while still in uniform with the New York Police Department.