"(or had to go through great trouble and embarrassment in fighting prosecution)"
Examples?
Apologies, but I fear I must temporarily withdraw my specific comment as I can't look up references right now, but if you want to search, I think one case was in Indiana, IIRC. Anyone familiar with the Duke lacrosse case knows that prosecutorial zeal can bear little relation to law enforcement, resting more upon personal "score" and success in the case, regardless of justice. Such a situation can easily foster false prosecutions, surely you can see...but I am unable to cite any specific cases for you now.