Just for perspective:
My wife and I spend a few days in a hotel. There are pictures and witnesses supporting that she looked normal the day before. A few days later, she has bruises on her wrists, arms, and a black eye. She says I roughed her up; I say that's all bull, that I only restrained her to allow me to leave the room. He said-she said. There are conflicting stories, maybe she even tried to get someone to say they saw something they weren't around to see. Now she's a bad witness, so the case is dropped. But a medical examiner can look at the injuries and say that based on coloring, the injuries definitely occurred over those same days we were in the hotel. Someone questions me, and I say "hey, maybe it happened at work or in a fight." They look into both of those, and there are witnesses that say nothing happened at work, and there was a tussle where the two ladies pulled hair, but no punches or wrestling. Now I say "maybe she fell down stairs."
This isn't going to court when there's no witness and my wife is not a credible witness because she tried to get a friend to say she saw what happened. Still, I can guarantee you everyone is going to believe I did something and that the odds are that I caused those bruises.
There's no proof other than my wife's bruises that were incurred while we were on vacation. It's her word against mine, but no witness. Only my very closest friends are likely to believe me. Maybe I'm wrong, but I think this is what led to the decision that was shared with Roger Goddell.