The Mendéz Principles build on interviewing models in England and Wales to offer a global standard for effective interviewing practices that ensure non-coercive methods and procedural safeguards; ahead of next month’s conference on the subject at the Canterbury Centre for Policing Research (CCPR), Policing Lecturer James Harris and CCPR Director Dr Martin O’Neill explore the background to the principles, and the development of techniques and lessons drawn from UK cases.