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Specially trained [[dog]]s can be used to detect explosives using their noses which are very sensitive to [[Dog#Smell |scents]]. While very effective, their usefulness becomes degraded as a dog becomes tired or bored.
These dogs are trained by specially trained handlers to identify the scents of several common explosive materials and notify their handler when they detect one of these scents. The dogs indicate a 'hit' by taking an action they are trained to
The explosive detection canine was originated at the Metropolitan Police Department in Washington, D.C. in 1970, by then trainer Charles R. Kirchner.<ref>Newlon, Clark (1974). ''Police Dogs in Action.'' New York, Dodd, Mead & co.</ref>
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