Unfortunately, as much as we know about head injuries, you can't really prove them absent an autopsy. We had one of the cleanest head injury cases I've ever seen, with abrupt 180 behavior changes that ultimately caused the person's life to fall to shambles. PTA mom ends up violent/abusive, unable to hold a job, etc. We tried the case twice and the jury didn't buy it. Over the years dealing with stuff like this I've come to the conclusion the whether its a head injury, emotional disturbance, mental illness or anything else where the defining symptoms are behavioral, the majority of people blame the person, as if its a choice, rather than the illness/injury.