There is video surveillance of them racing each other. There is no denying that. He admitted being next to them when the crash occurred.
I'm sure the state understood that drinking likely played a large part in the wreck. That and that there is no way to prove that Carter caused the wreck in and of himself when the staffer was impaired. So might as well settle for what they can prove.
But all of that doesn't mean his actions didn't contribute to how everything actually played out.
