You do not tell us what governmental office you work for. So-called reporting requirements should be available somewhere in writing if they exist. I am not aware of any statute in the State of Vermont that puts any kind of time limit on reporting, after which you would be in trouble for not reporting. You may be thinking of some kind of internal office policy.
Since this is an ongoing problem with this person, I would make a list of the things that have happened, along with the dates they occurred and sit down with a supervisor to discuss this ongoing, continuing problem.
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There is no law that I am aware of that would require you to report problems with your co-workers within 30 days. It would also be an odd office policy. See if you can find out where this rule is written. It may just be office folklore.
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