Abigail Finney was in her freshman year at Purdue University in Indiana in February 2017 when she fell asleep in her boyfriend’s dorm room. During the night he snuggled up to her in bed in the pitch black, his hand grazing her breast, and they began having sex. She soon stopped to go to the bathroom and, when she returned, discovered, to her horror, that it wasn’t her boyfriend who was in bed with her. Was it rape? Ms. Finney thought so and went to the police, who arrested Donald Grant Ward, the 19-year-old impostor. Mr. Ward, a friend of...