My airport experience was in Paris, France at Orly. I was on a student exchange program with students from Spain. This was back in 1976. I was about 18 or so, and going in line to get on the plane to Madrid. A man came up and placed me first in line to go through the litttle curtained off cubicle, where a French security agent checked everyone's pockets and carry on baggage.
Back then I looked like a long haired, bearded Viking barbarian...so I assume that's why they placed me first in line. The Security agent asked me to empty my pockets (he didn't even look through my carry-on bag). I did, and showed him a small pocket knife, which, being from the South, was no big deal for us. The Frenchman became a bit excited and said "Knif" (Kneef), to which I said "Knife" (Nife.) I held out my hand and he returned it to me, but was very reluctant to let me pass, until the first guy came in and said it was OK. Guess they were looking for something else, probably drugs.
So I went to Spain for six weeks and returned through Charles deGaul Airport...actually got to see a Concorde take off.
Customs seemed kinda lax to me upon my return to New York City. I bought a .22 pepperbox pistol in Madrid (black powder), and claimed this item on the claims list. Customs never checked for it, and passed me through without a search of my luggage. The item must not have been contraband, but it sure seemed strange to me, in after thought, that something like this could occur. Could have been they didn't read the list.
Of course this was back in 1976, when you probably couldn't get in trouble for that. Btw, the pepperbox is about as powerful as a BB gun, and would make a better weapon throwing it at someone after the shots are used up.
Les