system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What happens to innocent people who get identified in a police lineup?

Let's say I get asked by the police to be in a lineup because I look similar to the suspect. I'm innocent, but the witness/victim identifies me as the person who attacked them. Am I free to go, or is there any kind of investigation?
gpt
The line ups are staged.  They don't put a bunch of possible suspects in the line up, the line up has the one suspect and 4-5 other people that may look similar but are not at all under investigation.  If the witness points to anyone but the actual suspect then it casts doubt on the witness.