But we don't know that Mondesi didn't know it was in there.
We are taking his word for it.
If he got off, in direct violation to the agreed upon rules, then I would want to get off.
After all you can't prove that I knew what was in the cough syrup.
"Hey, I don't watch the news."
The point is if you start making exceptions for stuff that is collectively bargained it's a slippery slope.
The far more fair thing to do is just don't make exception and work off the letter of the law.