Dogs, especially their noses, have been an important law enforcement tool for ages, whether its scent tracking or sniffing out drugs or explosives. But one use has come under harsh criticism recently: the dog-scent lineup, reports The New York Times. In a dog-scent lineup, a dog smells contaminated items from the crime scene thought to hold the suspect's scent and then sniffs at scents swabbed from the suspect and other innocent people that match the suspect's description. The point is to have the dog signal his handler when it recognizes the scent from the crime scene during the scent lineup....