Purpose – The purpose of this paper is to consider a major cause of miscarriages of justice worldwide, namely the police investigative and interviewing process. Design/methodology/approach – This phenomenon is examined through the lens of psychiatric and psychological research findings and subsequent recommendations that have made a significant impact in term of changes to legislation, policy, and practice in the UK. Findings – The paper shows that despite major improvements in this area in the UK there is still no room for complacency, as miscarriages of justice continue to occur both here and worldwide. Research limitations/implications – This paper calls for researchers to continue to identify the weaknesses in the police investigative and interview process and to propose reform based on their scientific findings. Originality/value – The paper highlights what remains a somewhat neglected piece of the investigative jigsaw, namely the interviewing of adult victims and witnesses, pinpointing this as an area where transparency and further research is required.