Prosecutors say Jennifer Crumbley was grossly negligent when she failed to tell Oxford High School that the family had guns, including a 9 mm handgun that her son, Ethan Crumbley, used at a shooting range on the weekend before the Nov. 30, 2021, attack.
The answer is no,' Oakland County Judge Cheryl Matthews said. 'You're only allowed to consider the evidence that was admitted in the case.
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