Police officers make decisions every day under extreme pressure — in fractions of a second, with incomplete informations, under physical tension and emotional strain. What happens in the brain during these moments, how stress distorts perception, narrows thinking, and jeopardizes the ability to act — and how officers can nonetheless perform professionally and with composure — that is the subject of this book.This handbook examines the neuropsychological foundations of high-stress situations in law enforcement and provides practical answers to the question of why experienced officers sometimes react differently under pressure than they were trained to. It explains the role of the autonomic nervous system, cognitive biases, and emotional regulation processes in critical operational scenarios — and which scientifically founded strategies help maintain the capacity to act and perform even under extreme stress.The book is for police officers, supervisors, and trainers who wish to deepen their understanding of mental processing in operational settings — not as abstract theory, but as applicable knowledge.