This manual serves as the primary preparatory resource for candidates undertaking the National Investigators' Exam (NIE) in the United Kingdom. The authors, a team of experienced legal and policing experts, synthesize complex legislative requirements into a structured study framework. By combining detailed legal commentary with practical application exercises, the text aims to ensure candidates possess the necessary knowledge to meet national policing standards.

This publication is widely recognized as the official, authoritative text for police officers preparing for the NIE. Professionals frequently note that the manual is essential for navigating the dense legal requirements of the examination process.