As state legislatures increasingly turn their gaze to education and school policy, one intervention that is particularly concerning is the proposal to arm civilian school personnel. Under the guise of school safety, these policies suggest that allowing teachers, who often have little if any training, to carry weapons on school grounds may deter a school shooter or allow the teacher to directly confront a shooter. There is currently no empirical evidence to support the effectiveness of arming teachers. Rather, what we know from studies on school discipline, racial bias amongst teachers, efficacy of school resource officers, as well as the growing number of incidents of carelessness with firearms in schools, suggests that arming teachers may have grave consequences, particularly for Black and Brown students who are already disproportionately targeted by school disciplinary practices. This commentary explores the contours of this urgent debate and considers the potential for disparate impact by arming teachers.