The effect of suspect-filler similarity on eyewitness identification decisions: A meta-analysis.

Abstract

Eyewitness lineups are typically composed of a suspect (guilty or innocent) and fillers (known inno-cents). Meta-analytic techniques were used to investigate the extent to which manipulations of suspect-filler similarity influenced identification decisions. Compared with lineups with moderate or highsimilarity fillers, lineups with low similarity fillers were far more likely to elicit suspect identifications.This was true regardless of whether the suspect was guilty or innocent, underscoring the importance ofensuring the suspect does not stand out from the fillers. Although whether the lineup contained moderateor high similarity fillers had no reliable influence on guilty suspect identifications, a higher rate ofinnocent suspect misidentifications was found for moderate similarity lineups. The correspondencebetween the meta-analytic findings and current lineup construction recommendations is discussed.Keywords: similarity, eyewitness identification, meta-analysis, filler, lineup composition