Buried in an evidence room, a DNA swab held the key to catching a serial sex offender. But no one tested it for years. Detective Annie Harrison finally put the pieces together in two states 800 miles apart. This is the story of Untested, an exclusive true crime podcast from USA TODAY and Witness. The show's host, USA TODAY Investigative Reporter Gina Barton, joins The Excerpt to discuss the reporting that went into the series and why she thinks listeners should tune in.

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