If he only had one DUI and he was a juvie, it is possible it was never put on his record. He could have had his own insurance and been paying for it.
Without going into a long litany, I've lived some of this. Otter and I are good parents, with good kids. We kept tabs on our children, certainly more than most parents. Sounds cliche, but things happen. Kids do really, really stupid things. Hell, I did. I have been in situations with son #2 that I would have sworn would NEVER have happened to this child and I certainly didn't have blinders on when we were raising him.
My heart aches for all of the people involved in this tragedy.