Destructo6
Some dogs are know trained to smell specificaly for the scent of gun powder residue. They can't smell gun metal because its metal and about everthing is made of metal. The local sherriffs office has thought about getting a dog that could specifically search for firearms but they have not followed through with the thought as of yet. If you talk to some K-9 officers about the subject you can find out a whole lot more about the subject.
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