Also, I was being reductive because of the tone of your last sentence. Prosecutions are expensive and so are prisons.

People justify opening prosecutors to civil liability by saying that "they need to be held accountable." But prosecutors are already accountable. Their actions take place on public record. They have to justify themselves to defense counsel, a judge, and possibly a jury and an appellate panel. On top of all that, their immunity does not protect them from suits alleging bad faith.

The minimum we should require would be all death penalty cases and any where prison terms exceed a threshold, say those over five years? We cannot write off justice just because the process is difficult. Considering the power of prosecutors and countless stories of intimidation of both the accused and witnesses it should be a requirement