KYLE, Texas — The hallways of Lehman High School looked like any other on a recent fall day. Its 2,100 students talked and laughed as they hurried to their next classes, moving past walls covered with flyers that advertised homecoming events, clubs, and football games. Next to those flyers, though, were posters with a grim message warning students that fentanyl is extremely deadly.
Those posters weren't there last school year.
