The handwriting test and circumstantial evidence against Paul Freshour, including his connection to the booby trapped sign and previous discovery of letters with similar handwriting, led the sheriff to believe he was the Circleville letter writer, which was further reinforced by Karen Freshour's testimony.
The speaker discusses a suspicious incident involving a booby trap sign found at an intersection, with a possible link to a stranger seen in the area and conflicting witness testimonies.
The possibility of Karen's boyfriend driving her relative's El Camino to throw off the case is explored in the podcast.