You could also look into the Center for Policing Equity (http://cpe.psych.ucla.edu/) led by Phil Goff at UCLA (among many others). They have done a lot of work along these lines.
You may want to examine the research on police procedural justice and police legitimacy. These constructs examine the issue of police relationships with citizens. There is a wealth of research examining residents views of the police that focus primarily on demographics.
Thanks to all who have responded. Am following up on your leads/suggestions. Will provide more feedback once I have a chance to evaluate how these leads work against my requirements. Thanks again!!