My understanding of a Grand Jury sole responsibility is to evaluate the evidence a prosecutor has against a person to determine if there is enough evidence to file charges. My understanding is it's not the prosecutors job to put forth evidence during the grand jury that would normally be used by the defense, not the prosecution. There is a reason why it's not usual for the person the proceeding is about to testify before the grand jury although it does happen on occasion. There is also a reason why the old saying goes that a grand jury will indict a ham sandwich-they are given evidence against a person, not evidence that favors the person. Again, this is my understanding of grand juries and how they work. I now wonder though, in the grand jury instructions were they told part of their job was to determine who was lying and who was telling the truth? Where they told that at least one witness who claimed to be there wasn't even in town the day this all happened?
I've never been on a grand jury, but have been on a trial jury, and in the deliberations, everyone in the room would say who they did not believe the testimoney of. I don't remember anyone telling us to determine who was lying or telling the truth.
Is it the courts duty to tell jurors that their may be liars?
Usually, in my experience, when someone is lying, the story don't add up.
All IMO only