Maybe I'm too cynical. 
An organization that size with employees spending days together in tight quarters ... others knew or suspected. By participated, I mean shared info with the accused. They may not have realized it at the time but there's somebody in the company who's thinking, "I knew that SOB was up to something."
OK that makes more sense.
One thing that bothers me is how much organizations are willing to overlook and put up with from athletes.
