Professionals' views on how to conduct investigative interviews with adults with limited expressive language

Adults with communication impairment are vulnerable to abuse and are over-represented as victims in the criminal justice system. Investigative interviewers rely largely on verbal accounts to establish whether a criminal offence occurred, and therefore the way these accounts are elicited is paramount. To date, little research has evaluated whether current interviewing protocols are appropriate for eliciting accurate and detailed information from adults with communication impairment. The present study explored this issue through qualitative interviews with professionals from various disciplines. Specifically, professionals (N  = 22) who had extensive experience in interviewing, disability advocacy, and cognitive and communication impairment reflected on current recommended practice and how it could potentially improve. The results indicated widespread support for the current (open questioning) approach, although the professionals perceived that additional verbal and visual scaffolding could potentially enhance the amount of detail obtained without compromising accuracy. Suggestions for interview protocol modifications and future research are discussed.