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Fire Gun Detection Apparatus?
Hi! I and some friends recently saw armed forces walk on the streets carrying a device that detected guns (and it actually worked - some people got nailed) in houses made out of brick and/or cement block. I and some people who watched it discussed later about how we thought the gadget worked. We never came up with a plausible explanation. We don't have the faintest idea of how it works. If it was magnetic... well there are a lot of metal objects in every house; if it worked sniffing some kind of gas, as some proposed, how would it smell a gun that hasn't been fired in a long time? And wouldn't a dog be better? Well, we don't know. So I'm asking.
it probably detected organic explosives. they give off nitrogen dioxides and other gasses.
modern smokeless powder is mainly composed of nitrocellulose and nitroglycerin. these among others give off traceable gasses.
this is why tapping a spent shotgun shell above a person's bag to go to the airport is such a terrible joke. it gets detected and they get in trouble. i heard it also works with peanut butter because of the high nitrogen content.
however black powder will no be detected because it has no organic nitrogen.
some csi stuff about their hands and gunshot residue of fine metal particles could also be an answer but is not likely
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