Blackstone's Police Investigators' Q&A 2020 is the essential revision tool for all candidates sitting the National Investigators' Examination (NIE) examinations. Written in partnership with the best-selling Blackstone's Investigators' Manual, the only study guide endorsed by the College of Policing, the Q&A consists of over 200 multiple-choice questions arranged in the same order as the chapters in the Manual, providing the most authoritative means of self-testing outside of the NIE. With four parts, General Principles, Police Powers and Procedures; Serious Crime and Other Offences; Property Offences; and Sexual Offences, reflecting the Manual, Blackstone's Police Investigators' Q&A presents you with the only format of questions you will see in an NIE examination: Type A. Each question has a detailed and comprehensive answer that highlights not only the correct response, but also the reasoning behind the incorrect responses, allowing you to highlight any gaps or weaknesses in your knowledge. Full cross-references to the relevant Manual paragraphs and Keynotes encourage more effective studying, while a question checklist helps you track your progress. The introductory chapters also contain a useful section on how to study for the NIE, including advice on how to approach multiple-choice questions, practical exam techniques, and a 14-week revision plan. Fully updated for the 2020 syllabus, including coverage of relevant new legislation, the Policing and Crime Act 2017, including key revisions to PACE Codes C, E, and F, and significant case law decisions. This product is not endorsed by the College of Policing.