I appreciate the skepticism.
I'm the biggest skeptic you'll ever meet.
But no proof does not mean it didn't happen. It means there is no reason to believe that it did.
The overwhelming, taped video evidence of her dealings with the public and private are an indicator, but yes, you are correct, no proof this exact incident happened.
Darth,
i am sure it happened but the standard policy for hillary is deny, deny and deny some more until you get proven then lie about it till it goes away or somebody else takes the blame