Police do not work at the immediate direction of the communities they serve, but through their institutional connections. Police departments may develop structures, modi operandi, and cultures that are ethically problematic.
A great trick that I learned having worked as a screenwriter for many years, the way screenwriters work, is they break the project down into three-act structure: Act 1, Act 2, Act 3. I think that is a great way to break down any project, whether it's a new business or anything at all.