Using newly available data on all civil rights complaints submitted to the U.S. Department of Education's Office for Civil Rights related to racial discrimination in discipline between 1999 and 2018, I provide the first systematic evidence on how modern federal civil rights enforcement is used to address racial discrimination in discipline. I find that less than 50 percent of complaints received each year result in a federal investigation. I also find that 70 to 80 percent of investigations are closed due to insufficient evidence of a civil rights violation. Results also suggest that districts with higher shares of minoritized students, higher levels of segregation, and districts with larger racial educational gaps are more likely to receive a civil rights complaint after controlling for other district factors.