They Called 911 for Help. Police and Prosecutors Used a New Junk Science to Decide They Were Liars.

Tracy Harpster, a deputy police chief from suburban Dayton, Ohio, was hunting for praise. He had a business to promote: a miracle method to determine when 911 callers are actually guilty of the crimes they are reporting. “I know what a guilty father, mother or boyfriend sounds like,” he once said.

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