If this is true, then don’t all the cases downstream, that were discovered due to an legal investigation get thrown out?
Fruit of the poison tree, right?
Plus, the ostensible targets of the "formal" process were never charged. Carter Page, etc.
Prosecutors and investigators operate at what I view as the "fringe" of law - they have immunities, in some cases absolute immunity. This is why it is so important to only allow people with integrity into positions of power, there is scant (legal) remedy against the rogue.