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Unfortunately, they actually can go back to the violation if it happened while you were on probation even though it is now expired. The point is it happened while on probation.
Now, it is arguable that they should have not allowed an error to linger. And that is what you appeal will be based upon, even though there is no statute of limitations that would apply here.
Alright. So what is your question then? You wanted to know if they can go back and I answered yes. Do you have a follow up?