He has never been in legal trouble, alcohol related or otherwise.
well, we can take THAT out of the narrative, eh? if i understand the timing right, you were gone from the house approx 2 hours, then another 1.5 hours and the cops are at your door - he was found minus truck AND pants wandering around. prior to your departure, he'd come off a two hour nap and seemed reasonably coherent.
one would have to consume a lot of alcohol in a short period of time (less than 3.5 hours) to be so out of it they are traipsing around in their underwear, unable to recall where they left their vehicle etc. he was at one point driving a vehicle in that condition - before he abandoned it.
in other words, this guy has a very big problem with alcohol. a very strong and ultimately dangerous reaction, disease is well progressed. zero to 60, and all that.
it will be interesting and very telling what HE has to say. what HE says HE needs to do. that's what i would pay attention to. his words - and then more importantly his ACTIONS.