Although the prevalence of police-citizen conflict has diminished in recent decades, police use of excessive force remains a concern of police departments nationwide. This timely book focuses on what is known and what still needs to be learned to understand, prevent, and remediate police abuse of force. The topics covered include: a theory of police abuse of force; the causes of police brutality; measures of its prevalence; the violence-prone police officer; public opinion about police abuse of force; the issue of race; officer selection, training, and attitudes; police unions and police culture; administrative review; procedural justice and the review of citizen complaints; the role of lawsuits; and a survey of police brutality abroad. In the final chapter Geller and Toch suggest new directions for research and practical innovations in law enforcement, from which both police and citizens can benefit. The contributors to this volume are scholars of criminology, criminal justice, social psychology, law, and public administration; former police managers; a police union leader; civilian oversight agency administrators and analysts; civil liberties advocates; police litigation expert witnesses; and media commentators. The combination of theoretical and practical perspectives makes this book ideal for students and scholars of democratic policing and for those in police departments, government, and the media charged with addressing and understanding the problem of improper exercise of force.