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I have had this discussion with a military dog handler before. The way it was explained to me is that the dogs are usually trained for drugs OR explosives/gunpowder, but not both. In random sniff-searches, a dog's hit is more than enough to go through a car top to bottom. However, this is falling under the rules of military cops/military rules. Also, it was noted that the dogs will sometimes get super excited and home in on a leftover Mcdonald's bag crumpled up in the floorboard.