According to Paul Butler, Law professor at George Washington University, African American’s make up only 12% of the drug using population. But, 75% of all people in prison for drug crimes are Black! That is far out of proportion with the general using population.
This plays into the theory behind a previous post in which I made the claim that much of the inequality in this country is caused by institutional biases. Among these is the War on Drugs which, as an institution, disporportionately negatively affects Black Americans and poor Americans.