Doug Wyllie at PoliceOne:

The facts of the case showed that under Missouri law — and in accordance with Supreme Court precedent — Officer Wilson was justified in shooting Michael Brown. 

In fact, compared to other police use-of-force cases, this incident was pretty simple and pretty easy to evaluate. Under Missouri law, a police officer is authorized to use force in self-defense (when in fear of death or great bodily harm to himself or another person) and to effect an arrest or prevent escape under certain prescribed conditions