Eyewitness Memory as a Function of Post-identification Feedback.
The graph above shows the percentage of witnesses who recall being very certain, having a good view, being able to make out details of the culprit's face, ease of identification, and basis of identification. The control group (red bars) was given no feedback. The confirm group (blue bars) was given confirming feedback. The percentage of eyewitnesses who report having been very certain rises alarmingly to 50% if they received confirming feedback, compared to only 12% for the control condition.
Credit: Gary Wells