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Explosives into a building to test a dog. i walk, sit, and walk some more. so now i'm 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 that's 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 that's c 4. >> reporter: the u.s. capitol police are just starting to use vapor wake dogs. they augmented security at spoerding sporting events but amtrak embraced them despite the $20,000 pricetag per dog...

And now i'm 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. >> there's certain chefs that will smell a pot of stew and say it's oregano, the dog walks into it and says, oh, that's 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 $20,000 price tag per dog. the rail carrier says in a high-risk, ever-changing transit environment th...

Explosives in a building to test a dog. i walk, sit, and walk some more. so now i'm 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 large gathers. amtrak embraced them despite the pricetag per dog. rail carrier believes in a high ri...

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 i'm 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. >> there's certain chefs that will s...