– “Careful studies have demonstrated that, regardless of the level of certainty an eyewitness expresses at the time of original identification (which itself may be affected by numerous factors), a witness’s confidence in the correctness of the identification steadily increases over time. This occurs for psychological and cognitive reasons that have nothing to do with the accuracy of the identification, such as reinforcement of a witness’s beliefs by law enforcement and accounts of events promulgated by attorneys and news media.”
They aren’t as reliable as you might think.
Source: Eyewitnesses aren’t as reliable as you might think – The Washington Post