Zero tolerance discipline policies have come under criticism as contributors to racial discipline gaps; however, few studies have explicitly examined such policies. This study utilizes data from two nationally representative data sources to examine the effect of state zero tolerance laws on suspension rates and principal perceptions of problem behaviors. Utilizing state and year fixed effects models, this study finds that state zero tolerance laws are predictive of a 0.5 percentage point increase in district suspension rates and no consistent decreases in principals' perceptions of problem behaviors. Furthermore, the results indicate that the laws are predictive of larger increases in suspension rates for Blacks than Whites, potentially contributing to the Black--White suspension gap. Implications for policy and practice are discussed.