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4 answers

Gun oil & gun powder residue.

2007-07-15 11:26:13 · answer #1 · answered by Anonymous · 4 0

Same stuff bomb dogs are trained on. When its a run and ditch scenario, standard tracking dogs can pick up the human scent the suspect left on the weapon.

2007-07-15 18:40:04 · answer #2 · answered by California Street Cop 6 · 1 0

They smell human scents/oders that do not belong in the area

2007-07-16 01:00:14 · answer #3 · answered by alexthefett 2 · 0 0

Explosive residue. Gunpowder is an explosive and bullets contain gunpowder.

2007-07-15 19:58:50 · answer #4 · answered by STEVEN F 7 · 0 1

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