The Ghostbusters refrain "Who you gonna call?" typically connotes a lighthearted response to an unusual problem, but in the context of a human being suffering a mental health crisis, the refrain is anything but lighthearted. In an ideal world, "who you gonna call" would be a trained mental health professional. In the real world, the cry for help is usually received by the police. Police respond because there is no one else to assist. Police officers rank mental health crisis situations as far more stressful than crimes in progress. A person, suffering from mental illness is, by definition, not fully rational. Although they are likewise not fully irrational, behavior is unpredictable, and unpredictable behavior for the police is potentially dangerous behavior. As a consequence, outcomes of engagement between law enforcement and mental health consumers are too often tragic. No organization is more concerned about inadequate response than the police themselves. Improving Police Response to Mental Illness provides best practices guidance. A national pool of experts provide both insight and recommendations, ranging from the conceptual, Atypical Situations-Atypical Responses, to the pragmatic, Law Enforcement Training Models. Written specifically for the book, each chapter addresses a given critical component, including social policy, police response alternatives, training, legal constraints, and cooperative agreements with mental health service providers. This is an indispensable volume on the subject of police and mental health and is designed for police practitioners, mental health professionals, and scholars of social policy.