Capital punishment in the United States
In 1987, the Supreme Court decided a case called McCleskey v. Kemp.  McCleskey's lawyers showed that in Georgia, where McCleskey lived, black people convicted of killing whites were four times more likely to get the death penalty than people convicted of killing non-whites.  The Supreme Court accepted this, but ruled against McCleskey.  They wrote: "[inequalities] in sentencing are an inevitable part of our criminal justice system."  Since then, judges have not allowed lawyers to argue that racial bias plays a part in the death penalty.