Potential Causes of Racial Disparities in Wrongful Convictions Based on Mistaken Identifications: Own-Race Bias and Differences in Evidence-Based Suspicion

Objective: We explored whether racial disparities in evidence-based suspicion (i.e., evidence of guilt prior to placement in a lineup) provide a better explanation of racial disparities in exonerations based on eyewitness misidentification than the own-race bias in eyewitness identifications. Hypotheses: We predicted that the own-race bias in identification accuracy would be insufficiently large to fully explain the racial disparities in wrongful convictions in cases with mistaken identification. We also predicted that possible racial disparities in the prior probability of suspect guilt before subjecting suspects to the risk of misidentification might better explain racial disparities in wrongful convictions. Method: We conducted a meta-analysis on 54 effect sizes extracted from 16 studies (1,503 individual participants) that tested whether there was an own-race bias in eyewitness identifications using a design that varied the race of both the witnesses and the target faces (Black vs. White). We also constructed two curves that plotted the prior probability of suspect guilt against the posterior probability of guilt: one if an identification were to be obtained for a Black suspect and one if an identification were to be obtained for a White suspect. Results: Participants, irrespective of their race, were better able to discriminate among previously seen White than Black targets. However, the differential accuracy rates for identifications of White versus Black suspects were too small to explain racial disparities in exoneration data on their own. However, racial disparities in evidence that police have against suspects before placing them in an identification procedure would likely explain more of the variance in racial disparities in mistaken identifications that lead to wrongful convictions. Conclusion: Memory errors caused by the own-race bias are likely not the sole or even primary cause of racial disparities in misidentifications; rather, systemic bias in the amount of evidence that police have before placing a suspect at risk of misidentification likely explains more of the variance of racial disparities in wrongful convictions based on mistaken identifications. Requirements for evidence-based suspicion before placing suspects in an identification procedure are needed to prevent systemic racism in mistaken identifications.

Automated summary

This study examines whether racial disparities in evidence accuracy or own-race bias better explain racial disparities in wrongful convictions based on eyewitness misidentification. The results indicate that while there is a differential accuracy in identifying White and Black individuals, this alone cannot fully account for the racial disparities in wrongful convictions. Instead, the amount of evidence that police have prior to subjecting suspects to the risk of misidentification likely plays a larger role in explaining these disparities.