"The problems extend beyond the Washington area to school districts across the country and are among a host of concerns about school discipline that sparked a joint effort by the U.S. Justice and Education departments in July to look into reforms.
Experts say disparities appear to have complex causes. A disproportionate number of black students live below the poverty line or with a single parent, factors that affect disciplinary patterns. But experts say those factors do not fully explain racial differences in suspensions. Other contributing factors could include unintended bias, unequal access to highly effective teachers and differences in school leadership styles."