You can't say enough about having a pleasant and non-challenging demeaner. This all happened in Southern California. About three years ago I was returning home from a hunting trip and was tired and eager to get home and so I ran a stop sign (it was at night). I didn't notice that the car behind me was a police car. Of course I got pulled over but I had two bloody pig carcases in the back of my truck and three hunting rifles , in cases, laying across the back seat. I simple cooperated with the LEO and didn't challenge him on anything. The ticket was given and I drove off, no mention of the bloody carcasses in the back of the truck nor the rifles was made.
The mind sees what it expects to see. I was not a threat nor a trouble maker and that is exactly what the LEO saw.