In presenting police psychology as an evolving arena in the managerial and operational environment of law enforcement, book chapters are organized in seven parts. The first part contains a history of police psychological services and a discussion on professional concerns in the delivery of psychological services to police. The next three parts focus on core technologies of police psychology (evaluation, counseling, and training). Chapters specifically address personal reliability, legal issues, psychological fitness of law enforcement officers for duty, forensic psychology, employee assistance programs in police organizations, critical incident debriefing, police families, counseling issues related to police diversity, the role of police psychologists in training, and hostage negotiations training. The final three parts examine ways in which psychologists can support police organizations, organizational development and support, and new directions in police psychology (community policing, human resources management, human factors psychology, and strategic planning). References, tables, and figures