Right... it was a bad thing to do. So are we bashing and I missed the memo? I don't like talking bad about spouses. I'm sorry it's not my thing. I will always feel there is more to it and we never know. OP don't take offense this is hypothetical. She could have done something just as cruddy in the last few years. We all do stupid crap. I do it. DH does it. We all make really stupid mistakes. But do we learn from them? That's the question? I learned next time to keep my mouth shut when I get pulled over. Then 1 mile could have been ignored.
Then don't talk bad about your spouse. Problem solved!
I don't know how true this is anymore, OP, but years ago (we lived in oregon until 2000) if you went into court you would usually have a significant portion knocked off. If DH is willing to go in, admit he did it, say he is a poor college student and would appreciate any leniancy the court could show it might save you $100 at least. Since he's had a recent ticket, it is less likely, but that also makes it more likely your car insurance will be raised so you might want to look into it.
I definitely suggest going to court and just talking to someone. I agree, it's not as likely that the violation will be lowered due to the previous (recent) ticket, but it's worth a shot.
DP and I do this as well. Sometimes you just need an anonymous spot to vent!