The cop should be in big trouble, but he won't be. After all, without absolute indemnification he couldn't freely threaten and intimidate 13 year old girls over valid currency.
Someone needs to post a picture of the cop with the slogan "This is what Stupid looks like!". He also should be sued for incompetency, at the very least fired from the school. You don't threaten and intimidate a 13 year old girl for a nonsense charge. He also needs to apologize publicly to the girl and her family. What a loser.