The National Research Institute of Police Science (NRIPS) is an attached organization of the National Police Agency of Japan.Its role includes: research and development, identification and analysis, and training..
This study examined the associations between suspect confession and the timing of evidence disclosure, relational interviewing behaviours, and characteristics of the suspect and interrogator using a self-reported questionnaire completed by police officers. In total, 595 police officers who had interrogated suspects involved in serious crimes or residential burglary participated in the study. According to the police officers’ reports, in serious crime cases, the suspect was more likely to have made a full confession when at least one piece of evidence was presented after listening to the suspect’s entire story than in cases where evidence was presented earlier. In contrast, in residential burglary cases, the timing of evidence disclosure was not significantly associated with confession outcomes; regardless of when evidence was disclosed, more than 70
