Wells and Olsen have identified 2 variables that can affect the likelihood of accurate identifications:
- System Variables - refers to the methods or systems employed to try to maximise correct identification.
- Pre-line-up Instructions - given to the witness, such as explaining that a suspect might not be present
- The physical characteristics of the 'distractors' - It is important that the non-suspects are not obviously different from the suspect or the suspect would stand out
It is possible to control system variables. For example, one study showed that if a warning was given that the suspect might not be present in the lineup, identifications were reduced by 40%. However, it only reduced innacurate identification where the suspect was present by 2%
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