There is nothing particularly unusual or uncommon about showing a lineup that does not include the actual perpetrator to an eyewitness . All it means is that the police had a suspect (e.g., they think that John Doe did it), but he was not the perpetrator. In fact, every DNA exoneration case involving mistaken identification is exactly like that ... the actual perpetrator was not in the lineup that the witness viewed.
My point in this demonstration is to show what happens when witnesses are not explicitly warned that the perpetrator might not be present and are not given an explicit opportunity to make no identification.
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