Author contributions: The 1 st through 4 th and last authors developed the research questions, oversaw the project, and contributed equally. The 1 st through 3 rd authors oversaw the Main Studies and Replication Studies, and the 4 th , 6 th , 7 th , and 8 th authors oversaw the Forecasting Study. The 1 st , 4 th , 5 th , 8 th , and 9 th authors conducted the primary analyses. The 10 th through 15 th authors conducted the Bayesian analyses. The first and 16 th authors conducted the multivariate meta-analysis.

Interviewing of suspects, victims, and eyewitnesses contributes significantly to the investigation process. While a great deal is known about the investigative interviewing practices in the United Kingdom and the Nordic region, very little is known about the framework used by Malaysian police officers. A survey was administered to 44 Royal Malaysian Police interviewers serving in the Sexual, Women and Child Investigations Division (D11) of the Crime Investigation Department. Respondents were asked about the investigative interviewing techniques they use with suspects, witnesses, and victims; how effective they think these techniques are; and the training they had received. Findings revealed that many police officers currently possess limited knowledge of best practice investigative interviewing. More training, feedback, and supervision is needed and desired.

Author contributions: The 1 st through 4 th and last authors developed the research questions, oversaw the project, and contributed equally. The 1 st through 3 rd authors oversaw the Main Studies and Replication Studies, and the 4 th , 6 th , 7 th , and 8 th authors oversaw the Forecasting Study. The 1 st , 4 th , 5 th , 8 th , and 9 th authors conducted the primary analyses. The 10 th through 15 th authors conducted the Bayesian analyses. The first and 16 th authors conducted the multivariate meta-analysis.

No abstract