Once you're known enough, you will draw the ire of some unstable person wanting to do bad things to you, no matter what you do.
Is this what the TSA uses when they swab my dog/my hands? I always assumed it was to look for a bomb but I’ve never asked because I figured using the “b” word at the airport would only bring more trouble.
They often contain glicerine, which can be a compund in explosives.
I've had multiple friends confirm a negative test for GSR when they'd just been at the shooting range in the same jacket/etc.
We still have people accidentally bring guns/knives on planes...