If there are repeated offenses by one screener, it will start with a verbal warning from the Supervisor. Next will be a write up and a talk with the screening manager. Now I've seen these two things happen and the person in question become a lot better.
But on a third offense, I think it's either suspension and then possible termination.
All I know, is that what Ender83 typed does make my blood boil. And it's one of the reason I've decided to leave TSA as a whole. Stupid stuff like this seems to happen a lot because we hear about from passengers everyday at my airport.