have this responsibility. reporter: tkwr is why is he the only one in the world? because it s so hard to train a dog like this? it s hard to train, and the technology, the personnel that has to be able to back him up. it s very technical. reporter: and to give it back to you guys, they couldn t send him in if they knew there were chemicals released, of course. he would sniff any possible chemicals on board and go into what s marred. johnny is the only dog in the sheriff s department what that has his own badge, guys. jon: esacool looking lab, i guess, is he a labrador? looks like a lab. he s a lab, right? yes, sir. reporter: he s a lab, and he s very tame a. great dog. all the canine units are always great dogs but he s good to have on board and doesn t get sea sick. and he s sleepy, he wants a nap. he wants a nap! bye guys. jenna: remember this guys? a father striking a nerve, storming a school bus, giving a tongue lashing to the kids bullying his