Black Americans say they often experience difficulty with police that whites don't experience: extra scrutiny, harassment, profiling, even violence. Police say they have a difficult job that others just don't understand. What's it like to be both black and a police officer?

Matthew Horace is a former officer and the co-author of a fascinating memoir that explores this dynamic, The Black and the Blue: A Cop Reveals the Crimes, Racism, and Injustice in America's Law Enforcement.