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Explosives into a building to test a dog. i walk, sit, and walk some more. so now im going to hide this backpack full of smokeless powder. a minute later, ranger still in the early stages of training, tracks the explosives right to the source. >> there are certain chef thats smell a pot of stew and they say that is this type of spice. a dog walks into it and smells the whole thing and says thats c 4. >> reporter: the u.s. capitol police are just starting to use vapor wake dogs. they augmented se...

And now im going to hide this backpack full of smokeless powder right here. a minute later, rangers still in the early stages of training tracks the explosive scent right to the source. >> theres certain chefs that will smell a pot of stew and say its oregano, the dog walks into it and says, oh, thats c-4. >> reporter: the u.s. capitol police are just starting to use vapor wake dogs. they are using them at sporting events and other large gatherings, but amtrak has embraced them despite the $20,0...

Explosives in a building to test a dog. i walk, sit, and walk some more. so now im going to hide this backpack full of smokeless powder. a minute later, ranger in the early stages of training, tracks the explosive scent right to the source. >> there are certain chefs that say this is this type of spice. a dog walks into it and smells this and says that is c4. >> reporter: the adjustment capitol police are starting to use the vapor wake dogs. they augmented security at sporting events and other l...

Begin training the dogs to use their noses. back at the auburn facility, older dogs are conditioned on a souped-up golf cart to handle the rigors of their future job. they recognize about a dozen explosives, and can be trained to find additional ones in just a day or two. i take a backpack containing explosives into a building to test a dog. i walk, sit, and walk some more. and now im going to hide this backpack full of smokeless powder right here. a minute later, rangers still in the early stag...