I think way too much is being made out of who lied or did not lie.
I give up. If anyone will read the posts, I was not saying anyone lied or didn't lie. I frankly don't care at this point. All I was saying is that it is not true that the investigator did not have reason to lie, not that he did or didn't. Enough already. Let's all agree to be confused.
I do agree with you that there has been no proof whatsoever Diane was an alcoholic or drank all the time. The argument that she would have to have been a long time heavy drinker to be able to drive 1.5 miles straight down a highway is pretty weak. There is no medical proof that someone must be an experienced drinker in order to function at a particular level under the influence of alcohol. But, when you think about it, she really didn't function all that well anyway, did she?