Wow!! This is the first time I have read that. That is the most brilliant idea I have read in a long time.
It will protect both the child AND the teacher. There are countless accusations against teachers every year. With the advent of digital recording media, all could be recorded and stored for a period of time in a very small package. That way, when an accusation arises from either side, there would be a record of what REALLY happened. Keeps everyone honest.
I have two words for that idea —— teachers unions. (Biden would have called that three words.)