This book is the first to explore how psychological knowledge and research can be used to enhance police performance on a range of operational tasks, ranging from better identification of those giving false personal details, to the minimisation of cognitive bias in criminal investigations. Part of a textbook series designed to incorporate `evidence based policing' within Higher Education curriculums, each chapter encourages critical reflection followed by suggested further reading. Of benefit to both police practitioners and students of criminology, psychology, and policing, this unique book will help readers understand complex topics and point them in the direction of further avenues for research.