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The drugs have changed so fundamentally. you'd be hard pressed to believe, i think, that a wall would make a difference when you look at what is happening nowadays. what is the first thing that sort of flags this? >> sometimes it's driver's behavior. they're unnaturally nervous crossing the border. sometimes it's the car hasn't crossed the border a lot or sometimes the car has crossed the border too often. >> what you're witnessing here are efforts in stopping drugs from coming across the u.s. mexican border. >> almost every car crossing is crossing for a legitimate reason. only a small drug a...

From coming through the u.s. mexican border. >> almost every car crossing is crossing for a legitimate reason. it's a very small percentage that comes in carrying contraband. but i think when the inspectors pick up on something, their success rate is pretty high. when you saw the dog sit down in the back of the car, that's how that particular dog alerts. >> he overseas the field office for homeland security investigations and drugs are a big part of what he does. >> this is how it happens. what we're witnessing here is -- >> is what happens every day along the southwest border of the u.s. and ...