Dogs may be the best line of defense against subway attacks

    Even in an era of high-tech crime-fighting, the best line of defense against a Brussels-style attack on airports and subways has four legs and a tail.

    Dogs, with their exquisitely sensitive noses, have been trained in recent years to pick up the scent of explosives on people moving through crowded concourses,

    And so far, they have proved a better early warning system than anything engineers have come up with.

    Just this week, the New York City Police Department graduated of squad of these dogs.

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    But experts say there are not enough of these animals to go around. Only about 130 dogs have gotten the patented training nationwide since its development about a decade ago. And only one dog is in Europe, according to the chief trainer.

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