There are two major problems. One is when the witness to the crime is asked to come in and look at a line up they come with quite strong expectations that the bad guy is going to be in the line up and it’s their job to find them.
But the second one is the witness almost certainly is going to have a less than perfect memory. They’ve seen an event that they probably didn’t know was going to happen. They’ve seen it under not so great conditions. Then they’re asked to make a decision, a yes/no decision that says, yep that person was the bad guy or that person is not. A decision which has enormous consequences.
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