In this March 8, 2018 file photo, Alondra Alvarez, a student at Western International High School, goes through a metal detector and has her backpack checked as she enters the school in Detroit. Michigan would spend $20 million to upgrade security at up to 400 schools, expand a tip line that lets students report threats and require schools to incorporate behavioral health assessments into their procedures under a plan Gov. Rick Snyder outlined on Monday, April 16, 2018. (AP Photo/Carlos Osorio)
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