lets say i've got your username, "gtzulu" and speculate your password is "12345" because you're closet dawg fan and an idiot, then login and it works, proceed to post stupid öööö, then I'd venture to guess you may have a criminal something or other, right? I don't know, i hate lawyers and law, but it if you wanted to press charges, and the DA was stupid, and I was stupid and was found, then I imagine you may have some criminal complaint. Then lets add that this board, while public, belongs to a government entity then i imagine it gets more hairy.
i'm speculating of course. its stupid and embarrassing that they're pursuing this and it'll make it worse for them in the long run.
edited to add: i mentioned it in a prior post, but the justice system and legislation is so FAR behind technology its embarrassing...that's why they use such vague language.