Grand jury's have a great deal of investigative resources.
Combined with the ludicrous amount if sensationalist
"coverage" the media has spit at us then the involvement
of the Feds you can be sure absolutely no stone
went unturned.
The reality is there will always be a percentage of people, inflamed by ultralibs, who will never believe the information brought forth in an investigation is the truth because it doesn't mesh with what they believe. The majority of us then have to pay the costs for the destruction and mayhem these people cause.