The discovery process allows information from the NSA's collection process to be introduced as evidence in a lawsuit.
This puts the info into the PUBLIC RECORD
And allows it to be used in OTHER LAWSUITS.
So, if you sue me, I can get information about your criminal acts into the record through discovery. And then somebody else can charge you with your crime, and get you convicted based on evidence which can only be used in your trial, because it was DISCOVERED in my lawsuit, which YOU INITIATED.