As one who has been through just about every airport in the country and lots of them overseas, I must say that the level of scrutiny varies.

At big airports, mistakes like a small tube of toothpaste go right through. At a tiny midwest arport, a micro-tiny bottle of nailpolish caused my carry-on to be xrayed 6 times before they were satisfied. There were 7 TSA people and only about 50 passengers.