Drunk Driving Consequences?

i was driving on the same road just a few hours earlier since i grew up in that city (long beach).
i found out about the accident from a neighbor cop and it was pretty bad just hearing that the flower girl got decapitated. it was a mess on the highway and yesterday these pictures started coming out and they played the video in court but cut out the screams - they should have left the screams in. pretty awful, but what’s worse is the defense claims the mother destroyed evidence by moving her daughter’s head that was in her lap and taking it with her. what evidence does one need.