What is airport security looking for when they swab your clothes and bag?

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I know it’s some sort of explosives test, but I just walked through with a backpack I normally take to the range and no issues. I always assumed they were looking for gunpowder residue or something similar, but apparently not.

In:
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They are looking for trace chemicals that are commonly used in explosives that might have left residue on your clothes or body. Gunpowder explodes, so I imagine gunpowder is one of the things they’re looking for, unless you have heard otherwise.

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