Jennifer Crumbley, left, and James Crumbley, right, the parents of Ethan Crumbley, a teenager accused of killing four students in a shooting at Oxford High School in Oxford, Mich., appear in court for a preliminary examination on involuntary manslaughter charges in Rochester Hills, Mich., Feb. 8, 2022. Criminal investigations of parents and school employees are rare following a school shooting, experts say. But they appear to be gaining traction as communities demand accountability and new ways to prevent the violence. (AP Photo/Paul Sancya, File)
