TSA pulled me aside in San Diego one time, and decided they were going to swab my camera gear bag.... nine lenses, three bodies, two flashes, and a laptop. Another time I had flown home with a plumb bob in my back pack (whoops!). When I went to go back to work, they were going to try and confiscate it. I said that I had just flown with it three days before, and they could unscrew the tip, but they were not getting my 'bob (surveyors get sentimental over weird stuff...). The guy just stared at me for about five seconds, then let me go. Apparently terrorists aren't 6'6" 340 lb. pasty white guys with shaved heads. LOL