Like so many of the accused in Arthur Miller's play,The Crucible, Sarah Good finds herself accused as a witch. Though there is no tangible evidence that she is a witch, she is charged and found guilty simply because the "afflicted" girls called out her name. In order to save her life, Goody Good confesses to dealing with the devil. Even though Sarah has never interacted with the devil, it is obvious to everyone in the town (except the court) that the only way to survive the trials is to lie.
Sarah's false confession shows how the trials are not fair and are not based on the "innocent until proven guilty" motto that we rely on today.