This book rigorously examines police voices when people are reported missing, through empirical research. It explores the international literature in this emerging research field of missing people and presents new research of nearly 2,000 Constables from England and Wales, using quantitative and open qualitative questions. It explores the attitudes of police officers to Prevention Interviews (PI) of adults and children and examines whether the PI should be the responsibility of the police. It makes recommendations about best practice for the missing person process, advocating a more consistent, multi-agency approach to improve interventions.