Reform of school zero tolerance discipline policies is complicated by a lack of systematic evidence on the prevalence and characteristics of such policies. Through document analysis, this study compares explicit zero tolerance laws/policies and mandatory expulsion laws/policies across the domains of federal law, state law, district policy, and media portrayal. Results suggest that explicit zero tolerance laws and policies are rare, appearing in less than one in seven states or districts, whereas mandatory expulsion laws/policies are more common. Districts serving high proportions of minority students as well as districts consisting only of charter schools are more likely to have mandatory expulsion policies for certain offenses. Additionally, district zero tolerance policies apply to a broader set of offenses than state laws. Finally, state and district laws/policies tend to not apply to minor offenses to the degree suggested by media coverage. Implications for policy and practice are discussed.