Suppose they can't prove they're innocent. Suppose there's no evidence they did anything wrong.Where? The only thing I said is that it seems to me we are specifically being investigated for it, and it's not just standard procedure, and then sources came out afterwards and are backing that and the original source.
I think they can be proven to be innocent, or better said not guilty. And I most certainly hope it's not guilty. And no I wouldn't assume they knew, unless proven otherwise.
Suppose the only evidence is some balls that are slightly low in air pressure. Which might have happened naturally. Or not.
Then what? Then they can't prove they're innocent and can't prove they didn't "know" the balls were amiss. So they're guilty.