IMPLICIT BIAS

Racial Bias in Policing: Why We Know Less Than We Should
Phillip Atiba Goff, Kimberly Barsamian Kahn Social Issues and Policy Review, Vol. 6, No. 1, 2012, pp. 177--210 

Implicit Bias and Policing
Katherine B. Spencer, Amanda K. Charbonneau and Jack Glaser Department of Psychology, University of California, Berkeley
Social and Personality Psychology Compass 10/1 (2016): 50–63, 10.1111/spc3.12210

Police Researcher: Officers Have Similar Biases Regardless Of Race
June 22, 2020 | James Doubek | NPR
Rashawn Ray, a fellow at the Brookings Institution and a sociology professor at the University of Maryland, studies race and policing. He says that diversity helps but that "officers, regardless of their race or gender, have similar implicit biases, particularly about Black people." Ray says it's not enough to have Black cops in a Black neighborhood if they don't know the area.
Full interview 

IU research: More black police won't result in fewer police-involved homicides of black citizens (Feb. 2017)
BLOOMINGTON, Ind. -- Hiring more black police officers is not a viable strategy for reducing police-involved homicides of black citizens in most cities, according to new Indiana University research that is the first in-depth study of this increasingly urgent public policy question.
Until recently, no data existed that allowed a study of police homicides, according to the authors.  To produce the first peer-reviewed study of its type, researchers from Indiana University’s School of Public and Environmental Affairs, used new data from two sources:

• Mapping Police Violence, an advocacy group that developed a database of police homicides in 2014 in the 100 largest American cities.

• A Washington Post collection of data on police-involved homicides in 2015.

HARVARD IMPLICIT ASSOCIATION TEST (IAT)
Here is a tool that allows each of us to discover hidden cognitive biases. 
Most people are aware of their own overt biases, but it is very difficult for us to become aware of our covert biases.
The Implicit Association Test (IAT) is excellent for showing bias and how our unconscious drives our day to day decision making.  It helps all of us, from all backgrounds, recognize unconscious/hidden biases which may unknowingly distort our objective evaluation and treatment of others based upon race, gender, religion, culture, etc.