VanillaRose
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I thought that some where it said that they used his work clothes for the scent?
A lot depends on the quality of the item they use to establish his scent (known in trailing and tracking as the "scent article"). Anything that the missing or deceased has touched, held or been in the vicinity of might possibly be used as a scent article. In the case of a crime scene, it might be rather difficult to determine what object, if any, is relatively uncontaminated yet still solid enough to be used to target the search dog. The biggest problem occurs when the crime scene is contaminated unintentionally by those that first discovered it, or many hours have passed since the person they are searching for was present at the scene.. There's really a very small window of opportunity that typically exists in which to locate, protect, and use a person's scent to the investigator's advantage. I've worked with both search and cadaver dogs (not as a handler, simply working the scene) and what they can do is amazing but it is NOT infallible.