Here's an idea.
We reintroduce the death penalty.
In the event of a miscarriage of justice, the people responsible for that murder of an innocent person are put on trial. So, the lead investigation officer, the prosecution lawyer, the judge and the foreperson of the jury.
It's cut and dried that they are responsible. In fact, it's documented in court proceedings. No possibility of that being wrong. So they all hang.
I can't see how anyone could object to that, because we're suggesting that there will never be any miscarriages of justice. I'm sure all involved would be quite happy for my proposition to be adopted.