This article describes how the use of sworn law enforcement in American schools is patterned by school racial composition. Three distinct measures are constructed using data from the Civil Rights Data Collection and the School Survey on Crime and Safety: police prevalence, the degree of exposure that students have to police officers within their schools, and the roles of officers within those schools. Results show that police have become increasingly prevalent in schools with the largest shares of white students, especially at the elementary level. Yet youth in schools with the most Black, Latinx, and Native American students experience the highest exposure to police, and police in these schools are more frequently directed to carry out punitive tasks such as discipline. Student exposure to police is also relatively common in the whitest schools, but officers in these settings are more often used for tasks unrelated to punishment, such as teaching.