Regardless of what I carry I always get searched or have a problem.
I've taken a pipe smoking tool through with a semi blade to it and didn't casue any harm.....until I walked through and they did bomb residue test on my hands....mind you the pipe tool was just fine. I Get searched even outside of airports and in arenas always and I rarely if ever have done anything wrong or have contraband.
Reminds me of a story my mate tells... He is an explosives expert that works for the DoD here in australia. He was out testing that week and came home on the friday to fly intestate to see his GF. He was pulled up just after the metal detectors and asked to submit to an explosives test. In the event he was fully open with the guy saying that he was carrying his defense ID and that he is an explosives expert and had been out testing all week, but told the guy that he would return a negitive result to the explosives test because the stuff he had been testing all week was too advanced for the test.
I have bought TSA approved locks for when i travel to New Zeland later this year.