WARNING: This article has a pic of Mike Brown's body lying in the street during part of the 4.5 hours the police left it there. Some may not care to see that.
I can add one further dimension to this. In the wake of the reports in the media that there was no report or that the report contained no narrative statements of the officer – many have surmised that this was the result of what is know as the Garrity Rule. That rule, deriving from a US Supreme Court decision in the 1970s, states that a government employee cannot be coerced to provide incriminating testimony against himself – based on the fifth amendment right. The reason this applies to government employees, and not private sector ones, is because that amendment states that the government – not private entities – cannot compel a person to give self-incriminating testimony.