Jurors tend to rely heavily on forensic testimony, even when they don't understand it. andresr/E+ via Getty ImagesLedura Watkins was 19 years old when he was accused of murdering a public school teacher. At trial, a forensic expert testified that a single hair found at the scene was similar to Watkins’ and stated his conclusion was based on “reasonable scientific certainty.” He explained that he’d conducted thousands of hair analyses and “had never been wrong.” This one hair was the only physica