#11685. Police perceptions of eyewitness impairment due to alcohol and other drug use: a cross-cultural comparison

July 2026publication date
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Law;
Social Sciences (miscellaneous);
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Abstract:
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. 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, 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 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. It is concluded that, in order to rectify misconceptions about the impact of AOD intoxication on memory and improve investigative practices, both police would benefit from additional training on the effects of intoxication.
Keywords:
Alcohol; drug; memory; police; witness

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