Tennessee’s largest school district is reviewing all buildings older than 70 years with drop ceilings after one collapsed earlier this week. Memphis-Shelby County Schools said inspectors and engineers have been reviewing the damage after a drop ceiling collapsed in the library of Cummings K-8 Optional School on Monday. Three employees were treated for injuries after the ceiling collapse, which forced the evacuation of students, teachers and staff. Officials said the Cummings library building dates to 1930, when it was used as an auditorium, and the drop ceiling was installed in 1982.