That discrimination exists in courts of law is beyond dispute. In American murder cases, for instance, studies show that blacks who kill a white are much more likely to receive the death penalty than if they kill a black. Indeed, in Georgia, they are 30 times more likely to be condemned, and in Texas a staggering 90 times more likely. Conversely, in Texas, of 143 whites convicted of killing a black, only one was sentenced to die. But how extensive...