If there were threatening phone calls made--several of them--the plant will have tape recordings of same. He'll probably get roasted over "terroristic threats" as well as any assault weapons violations.
Friendly hint for those with lots of firearms, particularly if any of them are of dubious legality: keep a low profile.
His name is Dave or Doug Reza (sp) and he may be a "native American".
The yellow gas was very old tear gas kept in an ammo can way too long. The officers cracked open the can and got a dose.