Digital Commons Network^™

Mugshot Exposure Effects: Retroactive Interference, Mugshot Commitment, Source Confusion, And Unconscious Transference, Kenneth A. Deffenbacher, Brian H. Bornstein, Steven D. Penrod

Department of Psychology: Faculty Publications

More than 25 years of research has accumulated concerning the possible biasing effects of mugshot exposure to eyewitnesses. Two separate metaanalyses were conducted on 32 independent tests of the hypothesis that prior mugshot exposure decreases witness accuracy at a subsequent lineup. Mugshot exposure both significantly decreased proportion correct and increased the false alarm rate, the effect being greater on false alarms. A mugshot commitment effect, arising from the identification of someone in a mugshot, was a substantial moderator of both these effects. Simple retroactive interference, where the target person is not included among mugshots and no one in a mugshot …