Transcript for Meet Woody, the Bomb-Sniffing Dog
At Dulles airport that you'd think would would -- bomb sniffing dog to the test. He's patrolling as hundreds of people come through security checkpoint but both of these people had explosive material hidden in his -- -- part of the test. -- -- -- And then he's locked in. Catching debate. Good dark. But -- doesn't always work this well. There -- one layer of security and there is no perfect layered security. We have complementary layers -- where one has more ability another has a strained and they worked together to provide the best security for the traveling public. Look closely at this TSA video see the woman on the left and paint she's got an explosive training device in her bag. But the bomb sniffing dog walks right past her to pursue a passenger who has nothing dangerous three more on that video. Watch again the dog misses the target instead tracking the innocent passenger. You're using the dogs and ways of dogs -- not previously been used dogs of long proven to be very successful at sniffing out explosives in luggage but now -- are increasingly being. We're so busy airport terminals -- action. The GAO report criticizes the government for spending 100 million dollars on a new program. -- to 700 canine teams in roughly a year. Before knowing how well the dogs could do the job a lot of money gets spent before they know something works. A dog's -- is more sensitive than a humans by a magnitude of thousands of time. It just -- miles away. But in an airport terminal there may be hundreds of smells -- -- was different. He can be overwhelmed. Sources tell ABC news in the majority of tenth -- -- -- the explosive. But they also failed the actual failure rate is half -- the report called for more testing to know that this critical tool in an airport defense is being used in the best laid off. Pierre Thomas ABC news Washington.
This transcript has been automatically generated and may not be 100% accurate.