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Wrongful convictions plague California’s criminal justice system, and pretty much all participants and observers agree on the leading cause: faulty testimony from eyewitnesses. Police line up the suspects or show photos to people who saw either the crime or the events that led up to or followed it, and urge the witnesses to help them close the case and put the criminal behind bars. Wanting to do their duty, witnesses sometimes say, “I think that’s the guy” when what they are thinking is, “I really can’t tell.”