After an exhaustive evaluation of the latest scientific studies and literature State v. Henderson (NJ 2001) 208 N.J. 208, 27 A3d 872 concluded that the factors which affect the reliability of eyewitness identification include the following:
System Variables: whether the procedure was performed blind or double-blind, or with some other safeguard to ensure that the administrator had no knowledge of where the suspect appeared in the lineup; whether neutral pre-identification instructions were given to the witness; how well the lineup was constructed (presenting an adequate number of filler photos or individuals, choosing photos/participants that fit the witness's description, sequential administration of photos); whether the witness received any feedback about the suspect before, during or after the identification; contemporaneous recording of the witness's reactions when viewing the lineup ; whether the witness's confidence in the identification was reported immediately and before the possibility of any confirmatory feedback; avoiding confirmatory feedback after an identification; and avoiding multiple viewings of the same suspect in successive lineups; whether the witness had spoken with anyone outside of law enforcement about the identification, and what was discussed; and whether the witness initially chose someone other than the suspect in the lineup. [If a one-person showup is at issue, the court should determine whether it was performed more than two hours after the event, since research has shown that the accuracy of identifications drops off significantly after that time.]
Estimator Variables: whether the event involved a high level of stress; whether a visible weapon was used during a crime of short duration; how much time the witness had to observe the event; the distance and lighting conditions; relevant characteristics of the witness that would affect his or her ability to see or recall the event (including age and intoxication); relevant characteristics of the perpetrator that might impede an accurate identification (e.g., hat, sunglasses, facial hair); memory decay; cross-racial identification; exposure to suggestion by private actors such as other witnesses; and the time between the event and the lineup; and the speed with which the witness makes an identification from a lineup.
The court evaluated the effect of each of those factors on the accuracy of identifications, citing literature and expert testimony from the hearing. The court also evaluated evidence from studies measuring jurors' understanding of the science of memory and the psychology of eyewitness identification. The studies concluded that jurors often hold beliefs that run counter to the reality reflected in the research.
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