Are drugs laws the cause of "mass incarceration" of blacks in the United States?
The review article does not offer any statistics. Here are some from the US Bureau of Justice Statistics (a federal agency belonging to the DOJ) about state prisoners with sentences over one year (state sentences of less than a year are general served in county jails).
Only 4% of black state prisoners are sentenced for cases where the most serious offense is drug possession.
Only a further 11.9% of black state prisoners are sentenced for cases where the most serious offense is other drug crimes including trafficking.
58.3% of black state prisoners are sentenced for cases where the most serious offense is violent crime (including 12% for murder)... 16% for property crimes... 9.5% for public order crimes.
States account for over 92% of prisoners. Though over 50% of federal prisoners are sentence for cases where the most serious offense is drug crimes.
If no one was sentenced for cases where drugs crimes were the most serious offense, then 85% of black state prisoners would still be imprisoned. So, that wouldn't solve the problem of black "mass incarceration" in US state prisons.
Source: Bureau of Justice Statics http://imgur.com/sE1D137 http://felonvoting.procon.org/sourcefiles/USBJS%20-Prisoners...