Dr Hayley Cullen

Psychological research has been pivotal in influencing the way police forces globally approach and undertake criminal investigations. Increasing psychological research in recent years has led to the development of best-practice guidelines for conducting police investigations, across a number of key areas of criminal investigation. For example, procedures for creating and conducting lineups as recommended by the American Psychology-Law Society, and the UK-developed PEACE model for investigative interviewing, have both been of influence in Australia. However, the extent to which these evidence-based recommendations have been incorporated into policing practice within Australia is unclear. In this article, we conducted an exploratory review of publicly available policing documents within Australian states and territories, to determine the extent to which best practice lineup identification and investigative interviewing procedures have been adopted into police practice. The review revealed that for lineup identification procedures, many of the basic recommendations for conducting lineups were not incorporated into publicly available policing manuals. For investigative interviewing, it appeared on the surface that elements of the PEACE model were implemented within most Australian jurisdictions, albeit this was often not explicitly stated within policing documents. A key issue identified was a lack of (understandable) public transparency of policing procedure, as a number of Australian jurisdictions failed to have publicly available policing manuals or handbooks against which to evaluate their procedures. Therefore, we argue that there is a need for better collaboration between researchers and law enforcement in order to achieve evidence-based, transparent policing within Australia.

Victims, witnesses, and suspects of crime are frequently intoxicated by Alcohol or Other Drugs (AOD) during the event. How intoxication is perceived by investigating officers, and the manner in which this is handled during interview procedures, can affect the quality of information obtained and therefore investigative outcomes. Various factors are likely to contribute to how intoxication is handled during the investigation of a crime, including standard procedures, familiarity with the effects of different substances, and cultural attitudes. While findings with respect to the effect of different substances on memory are still emerging, it is important to investigate whether police beliefs are consistent with available evidence. In this study, Australian and Indonesian police officers were surveyed about their perceptions of memory accuracy and credibility of victims and witnesses intoxicated with various substances (e.g. alcohol, cannabis, amphetamines, and opioids). A higher proportion of Australian police identified larger negative memory effects associated with alcohol intoxication. At the same time, Indonesian police were found to be more likely to report that intoxication with alcohol would make a victim or witness less credible. With regard to timing, across multiple substances, larger proportions of Australian police reported believing that information obtained from witnesses that were still intoxicated would be more accurate than if interviewed after they became sober. It is concluded that, in order to rectify misconceptions about the impact of AOD intoxication on memory and improve investigative practices, both Australian and Indonesian police would benefit from additional training on the effects of intoxication.