Field data from lineups involving real eyewitnesses in criminal investigations reveal that eyewitnesses make errors at alarming rates—in nearly one out of every four lineups. Police investigators can prevent eyewitness misidentifications of innocent suspects by using research-informed procedures to collect eyewitness-identification evidence. Nine science-based best-practice procedures should be used by police investigators to enhance the reliability and integrity of memory evidence in cases involving eyewitnesses. These recommendations have been reviewed by the scientific and legal community andrepresent the official position of the American Psychology-Law Society.