Explosives detection Labrador retriever K9 Rrall sniffs bags, passengers, and the air for the scent of explosives at Will Rogers Airport in Oklahoma City, Tuesday, Nov. 20, 2012, as travelers head out of town for the Thanksgiving holiday. (AP Photo/Sue Ogrocki)

Associated Press
Explosives detection Labrador retriever K9 Rrall sniffs bags, passengers, and the air for the scent of explosives at Will Rogers Airport in Oklahoma City, Tuesday, Nov. 20, 2012, as travelers head out of town for the Thanksgiving holiday. (AP Photo/Sue Ogrocki)
Explosives detection Labrador retriever K9 Rrall sniffs bags, passengers, and the air for the scent of explosives at Will Rogers Airport in Oklahoma City, Tuesday, Nov. 20, 2012, as travelers head out of town for the Thanksgiving holiday. (AP Photo/Sue Ogrocki)
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