In an uncommon response to a dispute between faculty members, Northwestern University has banned a tenured professor of political science from campus and asked her to undergo a "fitness for duty" evaluation by a health professional before returning to her position. The ban follows an encounter the professor had this year with her associate chair, who says he is concerned she might try to kill him. But Jacqueline Stevens, the banned professor, says she has never been violent. She says the university is retaliating against her for her outspoken criticism of both the institution and her colleagues.