[acomjean]

I was in Denver about 10 years ago and went through the human size "sniffing" machine.

It was weird. I was the only one in line and they sent me through. You can keep shoes and belts on. Ushered into a telephone booth sized device. It had doors on both sides and puffed me with air. 10 or 20 seconds later the green light came the door opened and I walked out.

(I guess they're called "puffer machines") https://en.wikipedia.org/wiki/Puffer_machine