But that leads me to my third hard truth: something happens to people in law enforcement. Many of us develop different flavors of cynicism that we work hard to resist because they can be lazy mental shortcuts. For example, criminal suspects routinely lie about their guilt, and nearly everybody we charge is guilty. That makes it easy for some folks in law enforcement to assume that everybody is lying and that no suspect, regardless of their race, could be innocent. Easy, but wrong.

Hard Truths: Law Enforcement (2015)