Who said it wasn't? Its just interesting knowing the state of mind they were in before the incident happened. He was obviously drunk and fell asleep in the chair. He didn't know what hit him.
I doubt she smoked a joint before she offed him. She was a 20 yr old kid. Looking at her facebook pics she partied Regular.
And you must have missed the story of her DUI arrest just days before she committed murder. McNair was in the vehicle with her. She admitted she was high and not drunk. So she liked pot a lot. Also do not believe the hype that all pot smokers are peaceful and non violent when smoking.