Seeing these replies makes me think I interpreted what he said wrong. He did say that it didn't take long, so it's possible that the cop didn't show up, but hard for me to believe on such a big charge. I'll ask him for further details when I see him again, then report back. But to be clear, he did get off the charge completely.
Most of us want to know why as court rulings are normally universalized. If there is something that wasn't a technicality that resulted in the charges being dropped (ie. not a no show) than we need to know so we can use it when we go 49 ov...I mean to protect ourselves.