of auburn s canine handlers. they give the man in the red shirt a knapsack loaded with explosives inside a pressure cooker, just like the bombers in boston. watch as the dog catches a whiff. and just like he s trained to do, when the suspect stops, the dog stops, too. then sits down, alerting his handler to the bad guy. in a crowded mall or on a city street, this technique is crucial. these dogs can potentially stop a would-be bomber before it s too late. you think that if you had a vapor wake dog in boston, they might have detected the suspects before they were able to place those backpacks down? had one of our dogs been in place on that corner with those two guys walking there with those backpacks, i think they would have alerted on them. reporter: their training starts early, even as early as
reporter: amazing. and to follow that plume of vapor. reporter: auburn university professor jim floyd says vapor they can follow a plume or bomb vapor, stretching several football fields. a skill so unique, the university hopes to patent it. this video from the university shows a vapor weight dog in action. once he catches the odor in the air, he never lets up. we did our own experiment at this alabama mall with the help of auburn s k-9 handlers. they give the man in the red shirt a knapsack loaded with explosives inside a pressure cooker. just like the bombers in boston. watch as the dog catches a whiff. and just like he s trained to do, when the suspect stops, the dog stops too. then sits down, alerting his handler to the bad guy. in a crowded mall or on a city street, this technique is
a vapor wake dog s ability is to detect the odor coming off of that backpack on the back of someone as they carry it. reporter: amazing. and to follow that plume of vapor. reporter: auburn university professor jim floyd says vapor wake dogs are the ultimate bomb-sniffing dog. they can follow a plume or bomb vapor stretching several football fields. a skill so unique, the university hopes to patent it. this video from the university shows a vapor wake dog in action. once he catches the odor in the air, he never lets up. we did our own experiment at this alabama mall with the help of auburn s canine handlers. they give the man in the red shirt a knapsack loaded with explosives inside a pressure cooker, just like the bombers in boston. watch as the dog catches a whiff. and just like he s trained to
somewhere. a vapor wake dog s ability is to detect the odor coming off of that backpack on the back of someone as they carry it. reporter: amazing. and to follow that plume of vapor. reporter: auburn university professor jim floyd says vapor wake dogs are the ultimate bomb-sniffing dog. they can follow a plume or bomb vapor stretching several football fields. a skill so unique, the university hopes to patent it. this video from the university shows a vapor wake dog in action. once he catches the odor in the air, he never lets up. we did our own experiment at this alabama mall with the help of auburn s canine handlers. they give the man in the red shirt a knapsack loaded with explosives inside a pressure cooker, just like the bombers in boston. watch as the dog catches a whiff. and just like he s trained to
front of the restaurant. stay there several minutes. only when the first bomb explodes at 2:49 does he begin to walk away, leaving his knapsack on the ground, ten seconds later, it explodes. marathon veteran bob leonard relear took hundreds of photos. he looked to see if his time stamp picked them up too. he up loaded photos of the men s faces to the fbi. even with strong leads, no sign of the suspects. it was as if they had vanished after the bombing. had they left town or make the mistake of laying low until they could escape safely? authorities had no idea when hours after the suspects were id d, they got word of shots fired. 10:30 p.m., on the campus of