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Preview: Sniffing Out Bombs

|In a scene captured by 60 Minutes cameras, a dog in training is sent after a running volunteer about 50 yards away. The dog, which can run over 30 mph, quickly overtakes the man. Watch Lara Logan's report on Sunday, July 21 at 7 p.m. ET/PT for a rare glimpse inside the secretive world of America's most elite dogs.

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