Their explanation was that my
probation (six months) was unadjudicated, but the
offense was not.
My attorney (who explained it to me quite the opposite) went on to become the U.S Attorney in that district.
I really don't worry about it any more, since it has been 24 years, and I make sure I don't put myself in the circumstance of a repeat offense.
DUI was a bit of a joke before MADD changed everything. It's no joke any more.
One example: I knew someone who was arrested for DUI after having a couple of glasses of wine out to dinner some four years ago. His small children were in the car. CPS took the children away separately, and it was about a week before they were returned.