Costs and Benefits of Eyewitness Identification Reform

Abstract

Psychological science has come to play an increasingly important role in the legal system by informing the court through expert testimony and by shaping public policy. In recent years, psychological research has driven a movement to reform the procedures that police use to obtain eyewitness identification evidence. This reform movement has been based in part on an argument suggesting that recommended procedures reduce the risk of false identifications with little or no reduction in the rate of correct identifications. A review of the empirical literature, however, challenges this no-cost view. With only one exception, changes in eyewitness identification procedures that reduce the risk of false identification of the innocent also reduce the likelihood of correct identification of the guilty. The implication that criminals may escape prosecution as a result of procedures implemented to protect the innocent makes policy decisions far more complicated than they would otherwise be under the no-cost view. These costs (correct identifications lost) and benefits (false identifications avoided) are discussed in terms of probative value and expected utility.

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