Some advocates, however, say dogs are certainly part of the security equation.
"I'm not saying we should rely solely on dogs, but there's no question they can provide great deterrence in passenger screening," John Pearce, associate director of the Canine Training Center's Animal Health Performance Program at Auburn University in Alabama, told CSM.
According to Pearce, terrorists will have an easier time finding the security loopholes in screening technology than in a dog's nose.
"How do you calibrate a dog's nose?" he asks.
♦ Photo by mulmatsherm/Flickr