Book excerpt: In recent years, personality assessment by professional psychologists has taken on an increasingly important role in the field of police work. Most importantly, personality assessment instruments have been utilized in the pre-employment psychological screening of police officer candidates. This psychological screening takes place at the end of the hiring process to ensure that candidates do not have personality characteristics or existing psychopathology that would interfere with their job performance. Personality assessment is also used for other applications in police psychology. These applications include fitness-for-duty evaluations (FFDEs) and second opinion evaluations of officers who challenge hiring decisions. Moreover, police psychologists are involved in a considerable amount of research in order to determine which tests and scales are most appropriate for evaluations. The present volume is divided into four parts to cover the relevant issues in personality assessment for police work. Part I provides an introduction and the basic principles of personality assessment in police psychology. Part II focuses on the major assessment instruments used in police psychology. These include the MMPI-2, the Personality Assessment Inventory (PAI), the Inwald Personality Inventory (IPI) and Hilson Tests, the M-PULSE Inventory, pre-offer integrity instruments, and the Rorschach Comprehensive System. Part III examines multiple issues in personality assessment research in the field of police psychology. Part IV covers applications of personality assessment in police psychology. These applications include pre-employment evaluations, fitness for duty evaluations, conditional second opinion psychological evaluations of candidates, using multiple sources of information when conducting mandatory or required evaluations, and the politics of personality assessment in police agencies. This unique and comprehensive text is designed for psychologists who are actively working in the field of law enforcement, including psychologists in both applied and research/academic settings.