The Violation of Sarah McDavid (1981)

Sarah McDavid, an idealistic young teacher, takes a job in a rough high school where she is eventually attacked and raped in her classroom after school hours and decides to buck the school system in an attempt to make schools safer for students and teachers alike, against the advice of the school's principal, Dr. Keys, who tries to gloss over the hazardous conditions and the incident itself to avoid bad publicity and decreased enrollment.