Tonight midnight [uk]don't miss it AD interviews a US top dog handler on you tube. The use of dogs for search and rescue is not new. Specially trained dogs have been used across the world for decades. AD looks at the metadata and talks to leading expert and dog handler, to try to solve the Watts case,
Cadaver dogs do mess up from time to time: The McCanns have sought out attorneys who convinced a judge in Wisconsin that certain dogs were accurate just 22 percent to 38 percent of the time. (The prosecution claimed a success rate of 60 percent to 69 percent.) ... A dog's utility depends on the skill of its handler.
Cadaver dogs learn to spot the “smell of death” and find its source during the training process, which involves exposing them to either actual human remains—blood, teeth, bones—several pseudoscent formulas for training cadaver dogs—recently dead, post-decomposition, and drowning victim.) The dogs also learn to differentiate human remains from animal remains.
A dog’s utility depends on the skill of its handler. Identifying false signals is an important part of working with a cadaver dog, and results should be backed up with forensic testing. When a dog gives a signal, such as barking or sitting down, to indicate that it has smelled a corpse, a handler can only say something along the lines of, “My dog is giving an indication consistent with human blood.” He can’t say definitively that, yes, a body was present, without further confirmation—in the form of a blood stain, for example.
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