We have a right to remain silent... STFU and exercise it!!! Even if no Miranda has been given, "spontaneous utterances" are admissible in court by the prosecution.
Read he also admitted to drinking. His visible impairment while walking on the side of the road (at least it was winter and there was no fear of mosquitoes) rises to RAS for the interaction.
This "story" was posted here on the forum a while back.
I'm going out on a limb, but this sounds like a relative of the guy with the shooting range in his mobile home.