Yes they do. For example, in Washington DC where only about 28% of the cops are white, they have the largest disparity of black/white incarceration. In white conservative areas of the country the the ratio is smaller. Blacks in D.C. are thirty times more likely to be in jail.
POLITICS, IMPRISONMENT AND RACE
Another question regarding this issue: would it be more fair if police scrutiny of crime were relaxed for minorities? In other words, would the black community benefit if they did not have equal protection of the law?
I'm not sure cross-jurisdictional comparisons are valid. Especially for DC, which has a bizarrely skewed white population. What would be interesting to see is what the differential arrest rates are for white vs black policemen in DC.