Three experiments investigated Ss' ability to recognize a target person (whom they had previously seen) in a test series of ISO pictures of faces. The longer the original exposure to the target and the earlier the target picture appeared in the test series, the greater the probability of recognition. The pose position in the test series (front, profile, or portrait view) and the type of photograph (color or black and white) did not affect recognition. These results have implications for procedures used by law enforcement agencies in the process of a witness attempting to identify a criminal from a set of mug shots.