Practically everyone in town knows Amy Dugas is a serial batterer. But the Maine criminal justice system keeps finding ways to keep her from facing the music. In 2004 Amy assaulted her husband Mark in their home in Waldoboro. When the police officer came to arrest her, she kicked him in the groin. The judge released her on bail, ordering her to refrain from using weapons. Four months later she stabbed Mark with a foot-long kitchen knife, fatally severing his pulmonary artery. At the trial, she got away with the trusty I-feared-for-my-life alibi. Two years later Dugas spent 125 days...