Someone informed me that one of our teacher is not really a teacher. I don't want to fire them for an impersonating teacher.
What are the possible consequences in the future if you are not going to fire the impersonator?
If I don't they could take my license.
You should fire people who lie because they could harm the children. There might be other nefarious reasons for them lying about themselves.
Scary as it is there is a room with lockers for the employees and they do have a lot of things to hide.
That goes to show you that you should just handle this and get rid of the imposter. You never know what else they're hiding. Besides you don't want to get in trouble for hiring an unlicensed teacher.