Speaking of highly recommending traveling without an ID, on my way back from school last year, I got really stoned in my friend's car on the way to the airport. Me being stoned, I left my wallet in the car, and ended up at the airport with no ID.
I also got to go through the much-faster special screening, but I had to step into a chamber where they puffed you with air. Not for weed scent, for bombs, though I was mildly concerned at the time.
All in all a fun experience. Next time there's a big line at security, I'm going to tell them that I forgot my id. w00t
Bomb detectors are designed to pick up traces of nitrates, the theory being that if you are making a DIY bomb, you're going to go the ammonia-nitrate route.
Nitrates exist in fertilizer - and thats what folks make bombs out of.
Weed is often fertilized with nitrates, and trace amounts of these elements are present in your sweat, in your pee, and so on. When you go through a bomb detector after a heavy weed weekend or so, you're going to be flagged for closer inspection.
This was explained to me by a security agent at an airport I was travelling through after a heavy week in Amsterdam.
I also got to go through the much-faster special screening, but I had to step into a chamber where they puffed you with air. Not for weed scent, for bombs, though I was mildly concerned at the time.
All in all a fun experience. Next time there's a big line at security, I'm going to tell them that I forgot my id. w00t