Instead of the brass or shells, I wonder what would have been the outcome if I had been carrying a handgun in a inside the waistband holster, left it in the truck as I should to be legal and then he would have detected the residue from it. It could have been really interesting about then. Or maybe I simply cleaned a firearm this morning before we left the house.
BTTT
Since you were not flying, next time rub some W296 into your outer pants legs.