First, you will NEVER hear a raised voice at Narita security checkpoints.

Second, they will at ALL times be polite in the way that only Japanese can be polite.

Third, they will move you through much more smoothly than the US TSA does.

*IF* you set off their metal detector, they will do a careful wand search. For that, they will ask you to step up onto a low stool, and they will give you sandals while they check your shoes and wand you down.

*IF* the X-ray sees something that they feel they need a better look at, or *IF* you ask them to hand-check a film camera or photo film, they will NOT touch *ANY* of your property AT ALL until they have explicitly asked permission to examine the item and you have explicitly given permission. This is true EVEN IF you have just asked them to hand-check a film camera that is still in its case. They will STILL ask for explicit permission to touch it, open the case. (I used to carry a 35mm film SLR. I went through the drill twice.) The first time, once permissions had been handled, the inspector looked at it and was immediately satisfied that it was, in fact, a camera. The second time, the inspector looked, said he didn't see anything on the viewfinder display. Without thinking, I said "That's because it is powered off" and reached over and turned the camera on. He looked again, saw the viewfinder display alive, and was immediately satisfied.

I should add this: It was immediately obvious, in both cases, that the inspector knew EXACTLY what he was looking at.

Think about how the US TSA would react if you attempted to touch something while they were "inspecting" it.

For that matter, think about how the US TSA will likely react these days if you ask them to hand-check anything.

Narita airport security personnel are professionals, who do the absolute best they know how to do their job thoroughly while remaining unfailingly polite. The US TSA could learn a lot from them.