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Activist killed at police training center site had more than 50 gunshot wounds, autopsy finds

Actually, it only indicates the possibility they fired a gun. It tests for nitrates, and there are several common items that can give a false positive, most notably any type of common fertilizer.

Calling it "gunpowder residue" is a misnomer - it can be residue of a lot of things, including hot dogs.
but if you pee on your hands the test will be negative
 
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