Paul Connor, Cert Ed (FE), PG Cert (ODE), LLB, is a Police Training Consultant, teaching law to over 3,000 candidates since 2002. He is the author of the Blackstone's Crime Manual and the Consultant Editor for the Blackstone's Police Manuals. He is the author of Blackstone's Police Investigators' Manual, Blackstone's Police Investigators' Workbook and the Blackstone's Sergeants' and Inspectors' Mock Examination Paper. Glenn Hutton, BA, MPhil, FCIPD, is a director of Psychometric Technology Limited which designs and publishes psychological tests and provides selection and assessment services. Formerly a Superintendent in North Yorkshire Police, he also worked as Head of NPT Examinations and Assessment, Head of Training in North Yorkshire and as both Course Director and Director of Studies at the Police Staff College, Bramshill. David Johnston, LLB, LLM, is a barrister and Chief Superintendent in the Metropolitan Police Service. Formerly a member of the NPT Examinations and Assessment team, he is a former OSPRE Assessor and previously worked as a legal researcher for the Home Office in Harrogate. Elliot Gold is a barrister at Serjeants' Inn Chambers.