Studies have identified the post-identification feedback effect and suggest that in order to avoid it:

Question

Quizplus · Accepted Answer

The post-identification feedback effect occurs when feedback given to witnesses after they have made an identification influences their confidence in that identification. To avoid this effect, it is recommended that interrogators conducting the lineup or photo array be unaware of who the suspect is (a procedure known as a "double-blind" lineup), so they cannot inadvertently influence the witness's confidence or decision through verbal or non-verbal cues.

Studies Have Identified the Post-Identification Feedback Effect and Suggest That