Regardless of agreements or commissioners, is not this still America . Nobody has to volunteer information that puts them in jeopardy. Appeal this point in a court and there will be changes. IMO , if the NFL can't prove their own case without bullying people then they deserve to loose. If medical testing and Private Investigator surveillance is not invasive enough, then the confessions will not be forthcoming . Can anyone say "The Imposition" or "The McCarthy Hearings ", the powerful never do stop reaching for even more power .