If within the past few years you received a package, roamed a shopping mall, boarded a plane, train, ferry or cruise ship, went to a major sporting event, ran a marathon, attended a concert, gambled at a casino or visited a tourist attraction, chances are a dog made sure it was safe for you to do so.
With terrorists increasingly attacking so-called soft targets, the demand for detection dogs that can sweep large areas for explosives has soared. So have prices, which can exceed $25,000 for a single dog. Security experts warn that the supply of these dogs is dwindling worldwide and that the United States is especially vulnerable because it relies primarily on brokers who source dogs from Eastern Europe.
Technological alternatives have so far proven inadequate. Despite decades of trying, researchers have yet to develop a machine as exquisitely sensitive and discerning as a dog’s nose.