If he did, who calls the cops??? No a 9 year old shouldnt grab a random womans ass, no one should... but if he did for some reason, he was dare to, saw it on tv, or whatever, who has a break down like this woman is over it? You confront the child and the mother, and turn it into a teachable moment about respect for the child, not scream in the street and call the cops.
What is the child going to learn from this, even if he did do it?
Sanity is GONE.
The mistake is giving this attention whore what she wants—attention. Some people will do anything to get it, no matter how unethical.