Constructing
an eyewitness memory ROC includes the simultaneous lineup procedure and witness
confidence judgments using 100-point confidence scale. 100% indictated
absolutely certainity and 1% indicated slight confidence. The ROC  was computed form the “Thief Lineups” and the
hit or false alarms if they were made with confidence of 90% or higher. During
police lineups the incorrent identifications of an innocent suspect matter more
than incorrect identifications of the foil.