Most blacks and many whites assume that white cops are racists.
The General Social Survey asked the following question: "In general, how warm or cool do you feel towards African Americans?" Answers ranged from "very warm" (1) to "very cool" (9). There were only 13 white officers in the sample (and 2,080 other whites). The mean for the police is 3.62, and it's 3.65 for all other whites. No significant difference.
White officers do not differ from other whites in their attitudes towards blacks.