0.126 ug/ml nordiazapam in kidney
0.104 ug/ml nordiazepam in liver
Nordiazepam is an active metabolite to Diazepam, a drug in the Benzo class. The therapeutic levels of nordiazapam is between 0.1mcg/ml to 0.5mcg/ml...
So, he was taking diazepam (or one of the other benzos that also metabolize to this metabolite), and was currently within therapeutic levels.... However, Benzos and Alcohol have a synergistic effect, where the effect of each is greater then it would be for either alone.
Hope that helps!