Jeralyn is traveling, but I think she would want to highlight this Richard Moran Op-Ed on bad faith prosecution:

My recently completed study of the 124 exonerations of death row inmates in America from 1973 to 2007 indicated that 80, or about two-thirds, of their so-called wrongful convictions resulted not from good-faith mistakes or errors but from intentional, willful, malicious prosecutions by criminal justice personnel. (There were four cases in which a determination could not be made one way or another.)

Yet too often this behavior is not singled out and identified for what it is. When a prosecutor puts a witness on the stand whom he knows to be lying, or fails to turn over evidence favorable to the defense, or when a police officer manufactures or destroys evidence to further the likelihood of a conviction, then it is deceptive to term these conscious violations of the law — all of which I found in my research — as merely mistakes or errors.

Mistakes are good-faith errors — like taking the wrong exit off the highway, or dialing the wrong telephone number. There is no malice behind them. However, when officers of the court conspire to convict a defendant of first-degree murder and send him to death row, they are doing much more than making an innocent mistake or error. They are breaking the law.