No never suggested that. You said
but there seems to be no proof of that.
Never said you did suggest that. Was just clarifying in case that is what you meant.
Gunna, re-read our posts, you are complicating a simple point.
Both persons had been drinking (probably a lot) prior to the incident and the police know that. This info. can be gained from a variety of sources, usually just asking the persons themselves. There are standard alcohol questions that get asked with every incident and entered in the report.