Much of the reason the phrase “a prosecutor can indict a ham sandwich” exists is because the exculpatory rules only apply AFTER the defendant is indicted during the trial phase. Under the law, prosecutors need only present witnesses and evidence favorable to their case before the grand jury and need not share anything with the subject of the investigation. It is what it is and that is why these Dem urban prosecutors are able to have their media political show trials where they can unfairly ruin the reputation of the subject. Even when they lose the case, the damage had already been done.
You have just described lawfare.
It would seem that changes to such a procedure need to be made so the DA in such a case has skin in the game. If the exculpatory evidence present at the time of the Grand Jury presentation isn’t included, and the accused is declared innocent in a trial jury, the DA ought to be publicly hanged as a warning to other bureaucrats who want to abuse their position and authority.
In the days when Grand Juries and the rest of the judicial system was still constitutional, maybe 100 years ago. The Grand Jury was run by citizens and there were knowledgeable people on it. their job was to investigate grand crimes. The grand jury technically isn’t run by a prosecutor. It is run that way now because people don’t know how the law works. Its purpose was to protect citizens when there were grand crimes that needed investigation and all information that the grand jury wanted to uncover concerning the crime was available to them.
...lol, picture 2 kittens on your living room floor and they discover a ball of twine, then they pounce on it! Then you take it away and all of a sudden there is nothing to play with so they go back to their corners and wait for the next ball of twine.
Same goes for lawyers. In a Grand Jury proceeding, there are very few billable hours and the Grand Jury may dismiss so there is no case (ball of twine) to play with. But, let there be an indictment and there are potentially decades of billable hours. A rich client like Trump with billions is a defense lawyers dream and prosecutors (think Marcia Clark) get to write a book!
It’s all baked into the cake after CENTURIES of so called jurisprudence.