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